455% is the change from 180 to 999
Calculation steps:
[( 999 - 180 ) ÷ 180] x 100 = 455%
Formula
Percentage change = [(999 - 180) / 180] x 100
Subtract the new number by the original number
999 - 180 = 819
819 ÷ 180 = 4.55
4.55 x 100 = 455%
Example