Sum based on date cell not being empty

Hi there,

Looking for a bit of help with a formula, it's been years since I've used excel properly.

Here's what I'm trying to do:

I have a list of items and their prices, some of these items have been bought already and have the date of purchase stored in a date formatted cell.

I have a running total of these various items but I only want to sum the ones which have been purchased already ie only those with a purchase date.

I have the logic of how it should be done in my head, I just can't translate that in to a working formula.

Any help would be appreciated.

Cheers.