Using someone's credit card and paying back with extra

I live with my parents, and over the past few months, I've made some online purchases using my father's credit card (with his permission). Since there have been quite a few transactions, I’d like to repay him but it would take a bit of time to track every individual purchase.

Is it permissible if I give my father an amount that is more than the total of my purchases, ensuring I cover the minimum amount I owe him?

For example, if the purchases total $1000, I would return something like $1200 to cover any uncertainty.