1250% is the change from 18 to 243
Calculation steps:
[( 243 - 18 ) ÷ 18] x 100 = 1250%
Formula
Percentage change = [(243 - 18) / 18] x 100
Subtract the new number by the original number
243 - 18 = 225
225 ÷ 18 = 12.5
12.5 x 100 = 1250%
Example