55% is the change from 520 to 806
Calculation steps:
[( 806 - 520 ) ÷ 520] x 100 = 55%
Formula
Percentage change = [(806 - 520) / 520] x 100
Subtract the new number by the original number
806 - 520 = 286
286 ÷ 520 = 0.55
0.55 x 100 = 55%
Example