238.1% is the change from 21 to 71
Calculation steps:
[( 71 - 21 ) ÷ 21] x 100 = 238.1%
Formula
Percentage change = [(71 - 21) / 21] x 100
Subtract the new number by the original number
71 - 21 = 50
50 ÷ 21 = 2.380952380952381
2.380952380952381 x 100 = 238.1%