Examples with solutions for Quantity, percentage, percentage value: Calculation using percentages

Exercise #1

Calculate 25 over 75 as a percentage:

Video Solution

Step-by-Step Solution

To convert the fraction 2575 \frac{25}{75} to a percentage, we follow these steps:

  • Step 1: Identify the given fraction, which is 2575\frac{25}{75}.
  • Step 2: Simplify the fraction, if possible. Since both 25 and 75 are divisible by 25, simplify to 13\frac{1}{3}.
  • Step 3: Use the percentage conversion formula:
    NumeratorDenominator×100%\frac{\text{Numerator}}{\text{Denominator}} \times 100\%.
  • Step 4: Apply the formula:
    130.3333\frac{1}{3} \approx 0.3333. Multiply by 100 to convert to a percentage: 0.3333×100=33.33%.0.3333 \times 100 = 33.33\%.

Therefore, the solution to the problem is 33.33%.

Answer

33.33%

Exercise #2

Calculate 15 over 60 as a percentage:

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Convert the fraction to a decimal.
  • Step 2: Convert the decimal to a percentage.

Now, let's work through each step:

Step 1: The fraction given is 1560 \frac{15}{60} . To obtain the decimal equivalent, divide 15 by 60:
1560=0.25 \frac{15}{60} = 0.25

Step 2: Convert the decimal 0.25 0.25 to a percentage by multiplying by 100:
0.25×100%=25% 0.25 \times 100\% = 25\%

Thus, 1560 \frac{15}{60} as a percentage is 25% 25\% .

Therefore, the solution to the problem is 25% 25\% , which matches choice number 2.

Answer

25%

Exercise #3

Calculate 24 over 86 as a percentage:

Video Solution

Step-by-Step Solution

To solve this problem, we'll convert the fraction 24 over 86 into a percentage. Here's how it can be done:

  • Step 1: Divide the numerator by the denominator to convert the fraction into a decimal:
    24860.279069767\frac{24}{86} \approx 0.279069767
  • Step 2: Multiply the decimal by 100 to convert it into a percentage:
    0.279069767×10027.90697670.279069767 \times 100 \approx 27.9069767
  • Step 3: Round the result to one decimal place to get the final percentage:
    27.9%\approx 27.9\%

Therefore, the solution to the problem is 27.9%.

Answer

27.9%

Exercise #4

Calculate 37 over 93 as a percentage:

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Calculate the value of the fraction.
  • Step 2: Convert the fraction to a percentage.
  • Step 3: Match the result with the correct choice from the options provided.

Now, let's work through each step:
Step 1: Calculate the fraction: 3793 \frac{37}{93} . By dividing 37 by 93, we get approximately 0.397849462.
Step 2: Convert this value to a percentage by multiplying by 100: 0.397849462×10039.7849462% 0.397849462 \times 100 \approx 39.7849462 \%.
Step 3: Round to two decimal places to match standard percentage conventions: 39.7849462% 39.7849462 \% becomes 39.78% 39.78\% .

Therefore, the solution to the problem is 39.78%.

Answer

39.78%

Exercise #5

Calculate 27 over 63 as a percentage:

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given information
  • Step 2: Apply the percentage formula
  • Step 3: Perform the necessary calculations

Now, let's work through each step:
Step 1: We are given that the "Part" is 27 and the "Whole" is 63.
Step 2: We'll use the formula for percentage calculation: Percentage=(PartWhole)×100%\text{Percentage} = \left(\frac{\text{Part}}{\text{Whole}}\right) \times 100\%.
Step 3: Plugging in our values, we get:

Percentage=(2763)×100% \text{Percentage} = \left(\frac{27}{63}\right) \times 100\%

Simplifying the fraction 2763\frac{27}{63}, we find the greatest common divisor of both numbers, which is 9, thus:

2763=27÷963÷9=37 \frac{27}{63} = \frac{27 \div 9}{63 \div 9} = \frac{3}{7}

Then, we multiply by 100 to convert to a percentage:

Percentage=37×100%42.8571% \text{Percentage} = \frac{3}{7} \times 100\% \approx 42.8571\%

Rounding to two decimal places, we get 42.85%.

Therefore, the solution to the problem is 42.85%42.85\%.

Answer

42.85%

Exercise #6

Calculate 35 over 74 as a percentage:

Video Solution

Step-by-Step Solution

To solve this problem, the goal is to express the fraction 3574\frac{35}{74} as a percentage.

We follow these steps:

  • Step 1: Apply the formula for converting a fraction to a percentage:

Percentage=(PartWhole)×100%=(3574)×100%\text{Percentage} = \left(\frac{\text{Part}}{\text{Whole}}\right) \times 100\% = \left(\frac{35}{74}\right) \times 100\%

  • Step 2: Compute the value:

35740.47297\frac{35}{74} \approx 0.47297

Now multiply by 100 to convert this decimal to a percentage: 0.47297×10047.2970.47297 \times 100 \approx 47.297

Rounding to one decimal place gives us 47.3%47.3\%.

Answer

47.3%

Exercise #7

Calculate 35 over 84 as a percentage:

Video Solution

Step-by-Step Solution

To calculate what 35 over 84 as a percentage is, we follow these steps:

  • Step 1: Divide 35 by 84 and find the decimal equivalent.
    35840.416666\frac{35}{84} \approx 0.416666.
  • Step 2: Convert this decimal to a percentage by multiplying by 100:
    0.416666×100=41.6666%0.416666 \times 100 = 41.6666\%.
  • Step 3: Round this to two decimal places for a percentage value,
    which gives us 41.67%41.67\%. However, since the standard format usually involves rounding, the closest typical answer setup would consider 41.66%41.66\%.

Therefore, 35 over 84 as a percentage is 41.66%41.66\%.

Answer

41.66%

Exercise #8

The price of an air conditioner is 2500 dollars. At the beginning of the summer season, its price increased by 10% and at the end of the season its price decreased by 15%.

What is the price of the air conditioner at the end of the season?

Video Solution

Step-by-Step Solution

To solve this problem, we will walk through each step sequentially:

  • Step 1: Calculate the price after a 10% increase.

  • Step 2: Calculate the price after a 15% decrease from the increased price.

Now, let's work through these steps:
Step 1: The original price of the air conditioner is \2500 \). When the price is increased by 10%, the new price is calculated as follows: New price after 10% increase=2500×(1+10100)=2500×1.10=2750 \text{New price after 10\% increase} = 2500 \times \left(1 + \frac{10}{100}\right) = 2500 \times 1.10 = 2750

Step 2: This increased price of \2750isthendecreasedby15Final price after 15% decrease=2750×(115100)=2750×0.85=2337.52750 is then decreased by 15%. The new price after this decrease is calculated by:</p><p><span class="katex">\( \text{Final price after 15\% decrease} = 2750 \times \left(1 - \frac{15}{100}\right) = 2750 \times 0.85 = 2337.5

Therefore, the price of the air conditioner at the end of the season is 2337.5 2337.5 dollars.

Answer

2337.5 $