26.92% is the change from 520 to 660
Calculation steps:
[( 660 - 520 ) ÷ 520] x 100 = 26.92%
Formula
Percentage change = [(660 - 520) / 520] x 100
Subtract the new number by the original number
660 - 520 = 140
140 ÷ 520 = 0.2692307692307692
0.2692307692307692 x 100 = 26.92%