57.88% is the change from 520 to 821
Calculation steps:
[( 821 - 520 ) ÷ 520] x 100 = 57.88%
Formula
Percentage change = [(821 - 520) / 520] x 100
Subtract the new number by the original number
821 - 520 = 301
301 ÷ 520 = 0.5788461538461539
0.5788461538461539 x 100 = 57.88%