10% is the change from 390 to 429
Calculation steps:
[( 429 - 390 ) ÷ 390] x 100 = 10%
Formula
Percentage change = [(429 - 390) / 390] x 100
Subtract the new number by the original number
429 - 390 = 39
39 ÷ 390 = 0.1
0.1 x 100 = 10%
Example