What type of discount allows customers to get one item free for purchasing another?

The option that enables customers to obtain one item for free when they purchase another is the "Buy X get Y free" discount. This promotion strategically incentivizes customers to buy more by rewarding them with a free product upon the purchase of a qualifying item.

For example, if a customer buys one pair of shoes, they might receive a second pair of equal or lesser value for free. This type of promotion is effective in driving additional sales and encouraging customers to try out new products they may not have considered otherwise.

In contrast, the other options do not fit this specific type of promotion. A fixed amount discount provides a set monetary reduction on the price of a product but does not involve obtaining an additional item for free. A percent of product price discount reduces the price of an item by a percentage but again does not include a buy-one-get-one-free aspect. Lastly, a cart total discount offers a discount based on the total amount spent in the shopping cart, which does not pertain to the idea of incentivizing a specific purchase with a free item.