81.14% is the change from 281 to 509
Calculation steps:
[( 509 - 281 ) ÷ 281] x 100 = 81.14%
Formula
Percentage change = [(509 - 281) / 281] x 100
Subtract the new number by the original number
509 - 281 = 228
228 ÷ 281 = 0.8113879003558719
0.8113879003558719 x 100 = 81.14%