1025% is the change from 40 to 450
Calculation steps:
[( 450 - 40 ) ÷ 40] x 100 = 1025%
Formula
Percentage change = [(450 - 40) / 40] x 100
Subtract the new number by the original number
450 - 40 = 410
410 ÷ 40 = 10.25
10.25 x 100 = 1025%
Example