1000% is the change from 18 to 198
Calculation steps:
[( 198 - 18 ) ÷ 18] x 100 = 1000%
Formula
Percentage change = [(198 - 18) / 18] x 100
Subtract the new number by the original number
198 - 18 = 180
180 ÷ 18 = 10
10 x 100 = 1000%
Example