1100% is the change from 15 to 180
Calculation steps:
[( 180 - 15 ) ÷ 15] x 100 = 1100%
Formula
Percentage change = [(180 - 15) / 15] x 100
Subtract the new number by the original number
180 - 15 = 165
165 ÷ 15 = 11
11 x 100 = 1100%
Example