65.58% is the change from 520 to 861
Calculation steps:
[( 861 - 520 ) ÷ 520] x 100 = 65.58%
Formula
Percentage change = [(861 - 520) / 520] x 100
Subtract the new number by the original number
861 - 520 = 341
341 ÷ 520 = 0.6557692307692308
0.6557692307692308 x 100 = 65.58%