425% is the change from 8 to 42
Calculation steps:
[( 42 - 8 ) ÷ 8] x 100 = 425%
Formula
Percentage change = [(42 - 8) / 8] x 100
Subtract the new number by the original number
42 - 8 = 34
34 ÷ 8 = 4.25
4.25 x 100 = 425%
Example