42.31% is the change from 390 to 555
Calculation steps:
[( 555 - 390 ) ÷ 390] x 100 = 42.31%
Formula
Percentage change = [(555 - 390) / 390] x 100
Subtract the new number by the original number
555 - 390 = 165
165 ÷ 390 = 0.4230769230769231
0.4230769230769231 x 100 = 42.31%