1502.5% is the change from 40 to 641
Calculation steps:
[( 641 - 40 ) ÷ 40] x 100 = 1502.5%
Formula
Percentage change = [(641 - 40) / 40] x 100
Subtract the new number by the original number
641 - 40 = 601
601 ÷ 40 = 15.025
15.025 x 100 = 1502.5%
Example