1610% is the change from 40 to 684
Calculation steps:
[( 684 - 40 ) ÷ 40] x 100 = 1610%
Formula
Percentage change = [(684 - 40) / 40] x 100
Subtract the new number by the original number
684 - 40 = 644
644 ÷ 40 = 16.1
16.1 x 100 = 1610%
Example