3200% is the change from 15 to 495
Calculation steps:
[( 495 - 15 ) ÷ 15] x 100 = 3200%
Formula
Percentage change = [(495 - 15) / 15] x 100
Subtract the new number by the original number
495 - 15 = 480
480 ÷ 15 = 32
32 x 100 = 3200%
Example