Grey Company purchased merchandise at an invoice price of $4,000 and terms of 2/10, n/30. Half of the merchandise was labeled inaccurately and was returned immediately to the supplier. If Grey Company pays the remaining amount of the invoice within the discount period, what should that amount be? Select one: a $1,920 b. None of the above c. $1.200 d. $2,080 o $1,960