40% is the change from 390 to 546
Calculation steps:
[( 546 - 390 ) ÷ 390] x 100 = 40%
Formula
Percentage change = [(546 - 390) / 390] x 100
Subtract the new number by the original number
546 - 390 = 156
156 ÷ 390 = 0.4
0.4 x 100 = 40%
Example