1509.8% is the change from 51 to 821
Calculation steps:
[( 821 - 51 ) ÷ 51] x 100 = 1509.8%
Formula
Percentage change = [(821 - 51) / 51] x 100
Subtract the new number by the original number
821 - 51 = 770
770 ÷ 51 = 15.098039215686274
15.098039215686274 x 100 = 1509.8%