Explanation : Let the cost price be Rs 100/-.
Then, marked price is Rs 140/-.
Selling price = 40% discount on MRP
= 140 -140 x 40⁄100
=140-56
SP = Rs. 84/-
since SP < CP
∴ There is a loss.
Loss percentage = CP - SP⁄CP x 100
= 100 - 84⁄100 x100
= 16% Loss