4500% is the change from 18 to 828
Calculation steps:
[( 828 - 18 ) ÷ 18] x 100 = 4500%
Formula
Percentage change = [(828 - 18) / 18] x 100
Subtract the new number by the original number
828 - 18 = 810
810 ÷ 18 = 45
45 x 100 = 4500%
Example