450% is the change from 180 to 990
Calculation steps:
[( 990 - 180 ) ÷ 180] x 100 = 450%
Formula
Percentage change = [(990 - 180) / 180] x 100
Subtract the new number by the original number
990 - 180 = 810
810 ÷ 180 = 4.5
4.5 x 100 = 450%
Example