15.49% is the change from 820 to 947
Calculation steps:
[( 947 - 820 ) ÷ 820] x 100 = 15.49%
Formula
Percentage change = [(947 - 820) / 820] x 100
Subtract the new number by the original number
947 - 820 = 127
127 ÷ 820 = 0.1548780487804878
0.1548780487804878 x 100 = 15.49%