315.71% is the change from 70 to 291
Calculation steps:
[( 291 - 70 ) ÷ 70] x 100 = 315.71%
Formula
Percentage change = [(291 - 70) / 70] x 100
Subtract the new number by the original number
291 - 70 = 221
221 ÷ 70 = 3.157142857142857
3.157142857142857 x 100 = 315.71%