3990% is the change from 10 to 409
Calculation steps:
[( 409 - 10 ) ÷ 10] x 100 = 3990%
Formula
Percentage change = [(409 - 10) / 10] x 100
Subtract the new number by the original number
409 - 10 = 399
399 ÷ 10 = 39.9
39.9 x 100 = 3990%
Example