48.08% is the change from 520 to 770
Calculation steps:
[( 770 - 520 ) ÷ 520] x 100 = 48.08%
Formula
Percentage change = [(770 - 520) / 520] x 100
Subtract the new number by the original number
770 - 520 = 250
250 ÷ 520 = 0.4807692307692308
0.4807692307692308 x 100 = 48.08%