87.78% is the change from 270 to 507
Calculation steps:
[( 507 - 270 ) ÷ 270] x 100 = 87.78%
Formula
Percentage change = [(507 - 270) / 270] x 100
Subtract the new number by the original number
507 - 270 = 237
237 ÷ 270 = 0.8777777777777778
0.8777777777777778 x 100 = 87.78%