23.64% is the change from 660 to 816
Calculation steps:
[( 816 - 660 ) ÷ 660] x 100 = 23.64%
Formula
Percentage change = [(816 - 660) / 660] x 100
Subtract the new number by the original number
816 - 660 = 156
156 ÷ 660 = 0.23636363636363636
0.23636363636363636 x 100 = 23.64%