A store that advertises a buy-one-get-one-free sale is

sales promotions

Explanation:

Sales promotions are the steps taken to increase the purchase of the products by adding an incentive to the customers. Buy-one-get-one-free is one of the sales promotions. Here two products are sold in the cost of one. The customer is provided with the benefit of getting two products by giving the amount of one. It is the promotions in which quantity plays a crucial role.

it was decent, could have been a little better.. how bout you lol.

hi i’m a student too and i’ve had this app downalodes for a few weeks people do answer it you just gotta be patient and what is your question + subject i’ll you?