Final answer:
Ashton benefits from being able to use the keyboard immediately without full payment and securing a sale price with his credit card. However, there may be additional costs associated with credit card use.
Step-by-step explanation:
Ashton derives two main benefits from using his credit card to purchase the keyboard. The first benefit is that Ashton can use the keyboard while paying for it at a later time. This advantage allows him to practice and improve on the piano without needing the full amount upfront. Secondly, by using a credit card, Ashton might be securing the sale price of the keyboard, ensuring he doesn't miss out on the current price discount, which he may not get if he buys later. However, it is important to note that using a credit card is not necessarily cheaper than cash, and Ashton will likely have to pay an additional cost for using credit in the form of interest, unless he pays off the balance before interest accrues.