-9.58% is the change from 240 to 217
Calculation steps:
[( 217 - 240 ) ÷ 240] x 100 = -9.58%
Formula
Percentage change = [(217 - 240) / 240] x 100
Subtract the new number by the original number
217 - 240 = -23
-23 ÷ 240 = -0.09583333333333334
-0.09583333333333334 x 100 = -9.58%