Here we will show you how calculate the Percent Change from 15 to 21.

Basically, we are trying to find the change from 15 to 21 in terms of percent. We do this in three steps:

1) Find the difference between 15 and 21 as a number.

2) Divide the result from Step 1 by the starting number 15.

3) Multiply the result from Step 2 by 100 to get it in terms of percent.

The three steps above can be made into a formula. Thus, to find the percent change from 15 to 21, we use this formula:

**((Y-X)/X)*100 = Percent Change**

X is the starting number 15, and Y is the ending number 21 that it changed to. When we enter these numbers into the formula, we get:

**((21-15)/15)*100 = 40.00%**

Thus, the answer to the question "What is the Percent Change from 15 to 21?" is:

**40.00%**

Note: All percent answers are rounded to the nearest two decimals if necessary.

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