638.1% is the change from 21 to 155
Calculation steps:
[( 155 - 21 ) ÷ 21] x 100 = 638.1%
Formula
Percentage change = [(155 - 21) / 21] x 100
Subtract the new number by the original number
155 - 21 = 134
134 ÷ 21 = 6.380952380952381
6.380952380952381 x 100 = 638.1%