-17.5% is the change from 240 to 198
Calculation steps:
[( 198 - 240 ) ÷ 240] x 100 = -17.5%
Formula
Percentage change = [(198 - 240) / 240] x 100
Subtract the new number by the original number
198 - 240 = -42
-42 ÷ 240 = -0.175
-0.175 x 100 = -17.5%