35% is the change from 660 to 891
Calculation steps:
[( 891 - 660 ) ÷ 660] x 100 = 35%
Formula
Percentage change = [(891 - 660) / 660] x 100
Subtract the new number by the original number
891 - 660 = 231
231 ÷ 660 = 0.35
0.35 x 100 = 35%
Example