81.12% is the change from 339 to 614
Calculation steps:
[( 614 - 339 ) ÷ 339] x 100 = 81.12%
Formula
Percentage change = [(614 - 339) / 339] x 100
Subtract the new number by the original number
614 - 339 = 275
275 ÷ 339 = 0.8112094395280236
0.8112094395280236 x 100 = 81.12%