88.52% is the change from 270 to 509
Calculation steps:
[( 509 - 270 ) ÷ 270] x 100 = 88.52%
Formula
Percentage change = [(509 - 270) / 270] x 100
Subtract the new number by the original number
509 - 270 = 239
239 ÷ 270 = 0.8851851851851852
0.8851851851851852 x 100 = 88.52%