22.75% is the change from 668 to 820
Calculation steps:
[( 820 - 668 ) ÷ 668] x 100 = 22.75%
Formula
Percentage change = [(820 - 668) / 668] x 100
Subtract the new number by the original number
820 - 668 = 152
152 ÷ 668 = 0.2275449101796407
0.2275449101796407 x 100 = 22.75%