3771.43% is the change from 21 to 813
Calculation steps:
[( 813 - 21 ) ÷ 21] x 100 = 3771.43%
Formula
Percentage change = [(813 - 21) / 21] x 100
Subtract the new number by the original number
813 - 21 = 792
792 ÷ 21 = 37.714285714285715
37.714285714285715 x 100 = 3771.43%