400% is the change from 9 to 45
Calculation steps:
[( 45 - 9 ) ÷ 9] x 100 = 400%
Formula
Percentage change = [(45 - 9) / 9] x 100
Subtract the new number by the original number
45 - 9 = 36
36 ÷ 9 = 4
4 x 100 = 400%
Example