56.35% is the change from 520 to 813
Calculation steps:
[( 813 - 520 ) ÷ 520] x 100 = 56.35%
Formula
Percentage change = [(813 - 520) / 520] x 100
Subtract the new number by the original number
813 - 520 = 293
293 ÷ 520 = 0.5634615384615385
0.5634615384615385 x 100 = 56.35%