22.01% is the change from 668 to 815
Calculation steps:
[( 815 - 668 ) ÷ 668] x 100 = 22.01%
Formula
Percentage change = [(815 - 668) / 668] x 100
Subtract the new number by the original number
815 - 668 = 147
147 ÷ 668 = 0.22005988023952097
0.22005988023952097 x 100 = 22.01%