1350% is the change from 18 to 261
Calculation steps:
[( 261 - 18 ) ÷ 18] x 100 = 1350%
Formula
Percentage change = [(261 - 18) / 18] x 100
Subtract the new number by the original number
261 - 18 = 243
243 ÷ 18 = 13.5
13.5 x 100 = 1350%
Example