15.38% is the change from 520 to 600
Calculation steps:
[( 600 - 520 ) ÷ 520] x 100 = 15.38%
Formula
Percentage change = [(600 - 520) / 520] x 100
Subtract the new number by the original number
600 - 520 = 80
80 ÷ 520 = 0.15384615384615385
0.15384615384615385 x 100 = 15.38%