-92.5% is the change from 240 to 18
Calculation steps:
[( 18 - 240 ) ÷ 240] x 100 = -92.5%
Formula
Percentage change = [(18 - 240) / 240] x 100
Subtract the new number by the original number
18 - 240 = -222
-222 ÷ 240 = -0.925
-0.925 x 100 = -92.5%
Example