80.7% is the change from 285 to 515
Calculation steps:
[( 515 - 285 ) ÷ 285] x 100 = 80.7%
Formula
Percentage change = [(515 - 285) / 285] x 100
Subtract the new number by the original number
515 - 285 = 230
230 ÷ 285 = 0.8070175438596491
0.8070175438596491 x 100 = 80.7%