83.78% is the change from 339 to 623
Calculation steps:
[( 623 - 339 ) ÷ 339] x 100 = 83.78%
Formula
Percentage change = [(623 - 339) / 339] x 100
Subtract the new number by the original number
623 - 339 = 284
284 ÷ 339 = 0.8377581120943953
0.8377581120943953 x 100 = 83.78%