1900% is the change from 9 to 180
Calculation steps:
[( 180 - 9 ) ÷ 9] x 100 = 1900%
Formula
Percentage change = [(180 - 9) / 9] x 100
Subtract the new number by the original number
180 - 9 = 171
171 ÷ 9 = 19
19 x 100 = 1900%
Example