23.94% is the change from 660 to 818
Calculation steps:
[( 818 - 660 ) ÷ 660] x 100 = 23.94%
Formula
Percentage change = [(818 - 660) / 660] x 100
Subtract the new number by the original number
818 - 660 = 158
158 ÷ 660 = 0.23939393939393938
0.23939393939393938 x 100 = 23.94%