1000% is the change from 45 to 495
Calculation steps:
[( 495 - 45 ) ÷ 45] x 100 = 1000%
Formula
Percentage change = [(495 - 45) / 45] x 100
Subtract the new number by the original number
495 - 45 = 450
450 ÷ 45 = 10
10 x 100 = 1000%
Example