390% is the change from 10 to 49
Calculation steps:
[( 49 - 10 ) ÷ 10] x 100 = 390%
Formula
Percentage change = [(49 - 10) / 10] x 100
Subtract the new number by the original number
49 - 10 = 39
39 ÷ 10 = 3.9
3.9 x 100 = 390%
Example