1597.5% is the change from 40 to 679
Calculation steps:
[( 679 - 40 ) ÷ 40] x 100 = 1597.5%
Formula
Percentage change = [(679 - 40) / 40] x 100
Subtract the new number by the original number
679 - 40 = 639
639 ÷ 40 = 15.975
15.975 x 100 = 1597.5%
Example