91.07% is the change from 280 to 535
Calculation steps:
[( 535 - 280 ) ÷ 280] x 100 = 91.07%
Formula
Percentage change = [(535 - 280) / 280] x 100
Subtract the new number by the original number
535 - 280 = 255
255 ÷ 280 = 0.9107142857142857
0.9107142857142857 x 100 = 91.07%