59.62% is the change from 520 to 830
Calculation steps:
[( 830 - 520 ) ÷ 520] x 100 = 59.62%
Formula
Percentage change = [(830 - 520) / 520] x 100
Subtract the new number by the original number
830 - 520 = 310
310 ÷ 520 = 0.5961538461538461
0.5961538461538461 x 100 = 59.62%