4.23% is the change from 921 to 960
Calculation steps:
[( 960 - 921 ) ÷ 921] x 100 = 4.23%
Formula
Percentage change = [(960 - 921) / 921] x 100
Subtract the new number by the original number
960 - 921 = 39
39 ÷ 921 = 0.04234527687296417
0.04234527687296417 x 100 = 4.23%