53.69% is the change from 339 to 521
Calculation steps:
[( 521 - 339 ) ÷ 339] x 100 = 53.69%
Formula
Percentage change = [(521 - 339) / 339] x 100
Subtract the new number by the original number
521 - 339 = 182
182 ÷ 339 = 0.5368731563421829
0.5368731563421829 x 100 = 53.69%