A trade discount is the amount or percentage which a manufacturer deducts from the retail or advertised price of a product when it sells to a reseller or end customer. When Brenda bought a total of five computers for $3,300, a trade discount of 20% was already deducted. So in this particular question”what did Brenda pay for the computers? $2,640 $2,460 $2,440 $3,750 none of these” the answer is none of these. She paid the amount of $3,300.