29.63% is the change from 270 to 350
Calculation steps:
[( 350 - 270 ) ÷ 270] x 100 = 29.63%
Formula
Percentage change = [(350 - 270) / 270] x 100
Subtract the new number by the original number
350 - 270 = 80
80 ÷ 270 = 0.2962962962962963
0.2962962962962963 x 100 = 29.63%