Question

David increases his miles run per week from 2 miles to 3 miles. He says that he increased his miles by 66%. Find David's error and explain how to fix it.

A) David's error is 33%, and to fix it, he should recalculate the percentage increase.
B) David's error is 50%, and to fix it, he should recalculate the percentage increase.
C) David's error is 75%, and to fix it, he should recalculate the percentage increase.
D) David's calculation is correct; there is no error.

Answer 1

David's error is 50%, and to fix it, he should recalculate the percentage increase.

Step-by-step explanation:

To find the error in David's calculation, we need to calculate the actual percentage increase in his miles run per week. David initially runs 2 miles per week and then increases it to 3 miles per week. To calculate the percentage increase, we use the formula:

Percentage Increase = (New Value - Old Value) / Old Value * 100%

In this case, the old value is 2 miles and the new value is 3 miles:

Percentage Increase = (3 - 2) / 2 * 100% = 1 / 2 * 100% = 50%

Therefore, David's error is 50%, not 66%. To fix it, he should recalculate the percentage increase using the correct formula and values.