19.61% is the change from 770 to 921
Calculation steps:
[( 921 - 770 ) ÷ 770] x 100 = 19.61%
Formula
Percentage change = [(921 - 770) / 770] x 100
Subtract the new number by the original number
921 - 770 = 151
151 ÷ 770 = 0.1961038961038961
0.1961038961038961 x 100 = 19.61%