69.26% is the change from 270 to 457
Calculation steps:
[( 457 - 270 ) ÷ 270] x 100 = 69.26%
Formula
Percentage change = [(457 - 270) / 270] x 100
Subtract the new number by the original number
457 - 270 = 187
187 ÷ 270 = 0.6925925925925925
0.6925925925925925 x 100 = 69.26%