82.5% is the change from 280 to 511
Calculation steps:
[( 511 - 280 ) ÷ 280] x 100 = 82.5%
Formula
Percentage change = [(511 - 280) / 280] x 100
Subtract the new number by the original number
511 - 280 = 231
231 ÷ 280 = 0.825
0.825 x 100 = 82.5%
Example