1552.5% is the change from 40 to 661
Calculation steps:
[( 661 - 40 ) ÷ 40] x 100 = 1552.5%
Formula
Percentage change = [(661 - 40) / 40] x 100
Subtract the new number by the original number
661 - 40 = 621
621 ÷ 40 = 15.525
15.525 x 100 = 1552.5%
Example