67.31% is the change from 520 to 870
Calculation steps:
[( 870 - 520 ) ÷ 520] x 100 = 67.31%
Formula
Percentage change = [(870 - 520) / 520] x 100
Subtract the new number by the original number
870 - 520 = 350
350 ÷ 520 = 0.6730769230769231
0.6730769230769231 x 100 = 67.31%