700% is the change from 21 to 168
Calculation steps:
[( 168 - 21 ) ÷ 21] x 100 = 700%
Formula
Percentage change = [(168 - 21) / 21] x 100
Subtract the new number by the original number
168 - 21 = 147
147 ÷ 21 = 7
7 x 100 = 700%
Example