1952.5% is the change from 40 to 821
Calculation steps:
[( 821 - 40 ) ÷ 40] x 100 = 1952.5%
Formula
Percentage change = [(821 - 40) / 40] x 100
Subtract the new number by the original number
821 - 40 = 781
781 ÷ 40 = 19.525
19.525 x 100 = 1952.5%
Example