20.91% is the change from 770 to 931
Calculation steps:
[( 931 - 770 ) ÷ 770] x 100 = 20.91%
Formula
Percentage change = [(931 - 770) / 770] x 100
Subtract the new number by the original number
931 - 770 = 161
161 ÷ 770 = 0.20909090909090908
0.20909090909090908 x 100 = 20.91%