215.71% is the change from 70 to 221
Calculation steps:
[( 221 - 70 ) ÷ 70] x 100 = 215.71%
Formula
Percentage change = [(221 - 70) / 70] x 100
Subtract the new number by the original number
221 - 70 = 151
151 ÷ 70 = 2.157142857142857
2.157142857142857 x 100 = 215.71%