19.48% is the change from 770 to 920
Calculation steps:
[( 920 - 770 ) ÷ 770] x 100 = 19.48%
Formula
Percentage change = [(920 - 770) / 770] x 100
Subtract the new number by the original number
920 - 770 = 150
150 ÷ 770 = 0.19480519480519481
0.19480519480519481 x 100 = 19.48%