40.31% is the change from 392 to 550
Calculation steps:
[( 550 - 392 ) ÷ 392] x 100 = 40.31%
Formula
Percentage change = [(550 - 392) / 392] x 100
Subtract the new number by the original number
550 - 392 = 158
158 ÷ 392 = 0.4030612244897959
0.4030612244897959 x 100 = 40.31%