314.29% is the change from 70 to 290
Calculation steps:
[( 290 - 70 ) ÷ 70] x 100 = 314.29%
Formula
Percentage change = [(290 - 70) / 70] x 100
Subtract the new number by the original number
290 - 70 = 220
220 ÷ 70 = 3.142857142857143
3.142857142857143 x 100 = 314.29%