1542.5% is the change from 40 to 657
Calculation steps:
[( 657 - 40 ) ÷ 40] x 100 = 1542.5%
Formula
Percentage change = [(657 - 40) / 40] x 100
Subtract the new number by the original number
657 - 40 = 617
617 ÷ 40 = 15.425
15.425 x 100 = 1542.5%
Example