83.73% is the change from 338 to 621
Calculation steps:
[( 621 - 338 ) ÷ 338] x 100 = 83.73%
Formula
Percentage change = [(621 - 338) / 338] x 100
Subtract the new number by the original number
621 - 338 = 283
283 ÷ 338 = 0.8372781065088757
0.8372781065088757 x 100 = 83.73%