To calculate the increase from 10 percent to 15 percent, we need to find the difference between the two percentages.

Step 1: Find the difference between the two percentages:

15% - 10% = 5%

Step 2: Divide the difference by the original percentage:

5% / 10% = 0.5

Step 3: Multiply the result by 100 to get the percentage increase:

0.5 x 100 = 50%

### Therefore, the 10 percent increase to 15 percent represents a 50 percent increase.