307.14% is the change from 70 to 285
Calculation steps:
[( 285 - 70 ) ÷ 70] x 100 = 307.14%
Formula
Percentage change = [(285 - 70) / 70] x 100
Subtract the new number by the original number
285 - 70 = 215
215 ÷ 70 = 3.0714285714285716
3.0714285714285716 x 100 = 307.14%