Final answer:
Allan will be able to use either the debit or credit card to make the purchase.
Step-by-step explanation:
Allan will be able to use either the debit or credit card to make the purchase.
A debit card allows you to transfer money electronically from your checking account when making a purchase. Since Allan has $100 in his checking account, he can use his debit card to pay a portion of the $175 for the watch.
A credit card, on the other hand, is not directly tied to a bank account. It provides a short-term loan from the credit card company to the user. Allan can also use his credit card to make the purchase, as long as the credit card has a sufficient available credit limit.