-6.98% is the change from 258 to 240
Calculation steps:
[( 240 - 258 ) ÷ 258] x 100 = -6.98%
Formula
Percentage change = [(240 - 258) / 258] x 100
Subtract the new number by the original number
240 - 258 = -18
-18 ÷ 258 = -0.06976744186046512
-0.06976744186046512 x 100 = -6.98%