1507.5% is the change from 40 to 643
Calculation steps:
[( 643 - 40 ) ÷ 40] x 100 = 1507.5%
Formula
Percentage change = [(643 - 40) / 40] x 100
Subtract the new number by the original number
643 - 40 = 603
603 ÷ 40 = 15.075
15.075 x 100 = 1507.5%
Example