63.46% is the change from 520 to 850
Calculation steps:
[( 850 - 520 ) ÷ 520] x 100 = 63.46%
Formula
Percentage change = [(850 - 520) / 520] x 100
Subtract the new number by the original number
850 - 520 = 330
330 ÷ 520 = 0.6346153846153846
0.6346153846153846 x 100 = 63.46%