50.74% is the change from 270 to 407
Calculation steps:
[( 407 - 270 ) ÷ 270] x 100 = 50.74%
Formula
Percentage change = [(407 - 270) / 270] x 100
Subtract the new number by the original number
407 - 270 = 137
137 ÷ 270 = 0.5074074074074074
0.5074074074074074 x 100 = 50.74%