how to plumbing: How much could leaky faucets cost me?

I have a couple faucets that are for some reason starting to leak.
One of them leaks when you turn it on (leaks from the handle) and the other leaks a bunch when I don’t use it.

This has been going on for a while and I’m wondering just around how much money is wasted from this. My parent are going to try to get a plumber, but since they wait too long to call one up, more money is ”going down the drain”.