642.86% is the change from 21 to 156
Calculation steps:
[( 156 - 21 ) ÷ 21] x 100 = 642.86%
Formula
Percentage change = [(156 - 21) / 21] x 100
Subtract the new number by the original number
156 - 21 = 135
135 ÷ 21 = 6.428571428571429
6.428571428571429 x 100 = 642.86%