1582.5% is the change from 40 to 673
Calculation steps:
[( 673 - 40 ) ÷ 40] x 100 = 1582.5%
Formula
Percentage change = [(673 - 40) / 40] x 100
Subtract the new number by the original number
673 - 40 = 633
633 ÷ 40 = 15.825
15.825 x 100 = 1582.5%
Example