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What is 40% of 80?

To determine what 40% of 80 is, we start by understanding the concept of percentages. A percentage is a way to express a number as a fraction of 100. Therefore, 40% translates to 40 out of 100. To calculate 40% of 80, we can apply the following formula:

Percentage×Whole Number=Part of the Whole\text{Percentage} \times \text{Whole Number} = \text{Part of the Whole}

In this scenario, the percentage is 40%40\% and the whole number is 8080. The first step is to convert the percentage into a decimal by dividing by 100100:

40%=40100=0.440\% = \frac{40}{100} = 0.4

Next, we multiply this decimal by the whole number:

0.4×80=320.4 \times 80 = 32

Thus, 40%40\% of 8080 is 3232. This method can be applied to find any percentage of any whole number. Just remember to convert the percentage to a decimal first by dividing by 100100, and then multiply it by the whole number. This straightforward process allows you to determine the portion of the whole that the percentage represents.

Answered by: Prof. Peter Brown
IB Maths Tutor
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