62.81% is the change from 320 to 521
Calculation steps:
[( 521 - 320 ) ÷ 320] x 100 = 62.81%
Formula
Percentage change = [(521 - 320) / 320] x 100
Subtract the new number by the original number
521 - 320 = 201
201 ÷ 320 = 0.628125
0.628125 x 100 = 62.81%