53.85% is the change from 520 to 800
Calculation steps:
[( 800 - 520 ) ÷ 520] x 100 = 53.85%
Formula
Percentage change = [(800 - 520) / 520] x 100
Subtract the new number by the original number
800 - 520 = 280
280 ÷ 520 = 0.5384615384615384
0.5384615384615384 x 100 = 53.85%