83.57% is the change from 280 to 514
Calculation steps:
[( 514 - 280 ) ÷ 280] x 100 = 83.57%
Formula
Percentage change = [(514 - 280) / 280] x 100
Subtract the new number by the original number
514 - 280 = 234
234 ÷ 280 = 0.8357142857142857
0.8357142857142857 x 100 = 83.57%