Answer:
The selling price is the same amount in which merchant sold the sofa.
Step-by-step explanation:
Cost Price is the amount in which a person buys the item.
Selling Price is the amount in which a person sells the item.
The merchant purchased a sofa from a manufacturer for $400 then this price $400 is the Cost Price of the sofa.
Selling Price is the amount in which the merchant sold the sofa.