39.85% is the change from 399 to 558
Calculation steps:
[( 558 - 399 ) ÷ 399] x 100 = 39.85%
Formula
Percentage change = [(558 - 399) / 399] x 100
Subtract the new number by the original number
558 - 399 = 159
159 ÷ 399 = 0.39849624060150374
0.39849624060150374 x 100 = 39.85%