1580% is the change from 40 to 672
Calculation steps:
[( 672 - 40 ) ÷ 40] x 100 = 1580%
Formula
Percentage change = [(672 - 40) / 40] x 100
Subtract the new number by the original number
672 - 40 = 632
632 ÷ 40 = 15.8
15.8 x 100 = 1580%
Example