Concept:A trade discount is a reduction from the invoice price given to a retailer so the retailer can make a profit.
Explanation:The discount described is taken from the invoice price of goods.
It is allowed to a retailer or middleman who buys goods for resale.
This reduction creates a margin between the cost price and the expected selling price.
The retailer uses that margin to cover expenses and earn profit.
A cash discount is not correct because it is offered for early or prompt payment of an invoice.
A functional discount is given for performing certain distribution functions.
A seasonal discount is offered for buying goods outside the main selling season.
Only a trade discount is directly deducted from the invoice price to enable the retailer to profit.
Answer:C. trade discount