Final answer:
To calculate the percent increase in free throws made by James, subtract the original number made from the new number made, divide by the original number, and multiply by 100. James improved from 15 to 21 free throws, which is a 40 percent increase.
Step-by-step explanation:
The question is asking for the percent increase in the number of free throws made by James from one session to another. To find the percent increase, we compare the difference in the amount made to the original amount and then convert that number to a percentage.
James originally made 15 out of 25 free throws, and later he made 21 out of 25 free throws. The increase in the number of free throws made is 21 - 15 = 6. To find the percent increase, we use the formula:
Percent Increase = (Increase/Original Number) x 100 = (6/15) x 100 ≈ 40%
Therefore, the percent increase in the number of free throws made by James is 40 percent.