83.19% is the change from 339 to 621
Calculation steps:
[( 621 - 339 ) ÷ 339] x 100 = 83.19%
Formula
Percentage change = [(621 - 339) / 339] x 100
Subtract the new number by the original number
621 - 339 = 282
282 ÷ 339 = 0.831858407079646
0.831858407079646 x 100 = 83.19%