62.5% is the change from 320 to 520
Calculation steps:
[( 520 - 320 ) ÷ 320] x 100 = 62.5%
Formula
Percentage change = [(520 - 320) / 320] x 100
Subtract the new number by the original number
520 - 320 = 200
200 ÷ 320 = 0.625
0.625 x 100 = 62.5%
Example