57.12% is the change from 520 to 817
Calculation steps:
[( 817 - 520 ) ÷ 520] x 100 = 57.12%
Formula
Percentage change = [(817 - 520) / 520] x 100
Subtract the new number by the original number
817 - 520 = 297
297 ÷ 520 = 0.5711538461538461
0.5711538461538461 x 100 = 57.12%