86.3% is the change from 270 to 503
Calculation steps:
[( 503 - 270 ) ÷ 270] x 100 = 86.3%
Formula
Percentage change = [(503 - 270) / 270] x 100
Subtract the new number by the original number
503 - 270 = 233
233 ÷ 270 = 0.8629629629629629
0.8629629629629629 x 100 = 86.3%