337.14% is the change from 70 to 306
Calculation steps:
[( 306 - 70 ) ÷ 70] x 100 = 337.14%
Formula
Percentage change = [(306 - 70) / 70] x 100
Subtract the new number by the original number
306 - 70 = 236
236 ÷ 70 = 3.3714285714285714
3.3714285714285714 x 100 = 337.14%