3800% is the change from 10 to 390
Calculation steps:
[( 390 - 10 ) ÷ 10] x 100 = 3800%
Formula
Percentage change = [(390 - 10) / 10] x 100
Subtract the new number by the original number
390 - 10 = 380
380 ÷ 10 = 38
38 x 100 = 3800%
Example