91.48% is the change from 270 to 517
Calculation steps:
[( 517 - 270 ) ÷ 270] x 100 = 91.48%
Formula
Percentage change = [(517 - 270) / 270] x 100
Subtract the new number by the original number
517 - 270 = 247
247 ÷ 270 = 0.9148148148148149
0.9148148148148149 x 100 = 91.48%