Final answer:
Yes, the customer can use the same gift certificate towards a new purchase. They can use the remaining balance from the gift certificate for future purchases.
Step-by-step explanation:
Yes, the customer can use the same gift certificate towards a new purchase. The gift certificate can be considered as a form of payment. In this case, the customer has used $75 of their $100 gift certificate, so they still have $25 remaining. They can use this remaining balance towards their new purchase.
For example, if they make another purchase for $50, they can use the $25 remaining on their gift certificate and pay the remaining $25 using another payment method.
It's important to note that gift certificates usually have an expiration date, so the customer should check if there are any time limitations on using the gift certificate.