81.07% is the change from 280 to 507
Calculation steps:
[( 507 - 280 ) ÷ 280] x 100 = 81.07%
Formula
Percentage change = [(507 - 280) / 280] x 100
Subtract the new number by the original number
507 - 280 = 227
227 ÷ 280 = 0.8107142857142857
0.8107142857142857 x 100 = 81.07%