30.74% is the change from 270 to 353
Calculation steps:
[( 353 - 270 ) ÷ 270] x 100 = 30.74%
Formula
Percentage change = [(353 - 270) / 270] x 100
Subtract the new number by the original number
353 - 270 = 83
83 ÷ 270 = 0.3074074074074074
0.3074074074074074 x 100 = 30.74%