83.21% is the change from 399 to 731
Calculation steps:
[( 731 - 399 ) ÷ 399] x 100 = 83.21%
Formula
Percentage change = [(731 - 399) / 399] x 100
Subtract the new number by the original number
731 - 399 = 332
332 ÷ 399 = 0.8320802005012531
0.8320802005012531 x 100 = 83.21%