First off I want to say thanks if anyone can help me. Thank!

I have an inventory sheet that has always been in word but I put it in Excel and have one problem.
The last three columns are price per unit, numbered ordered and total cost. All I want to do is set it up so that when I enter a number ordered it will automatically calculate the total cost. I know how to do each row individually but not how to set it up so that all you have to do is enter the amount ordered and automatically get the total cost.

I hope someone understands what I am trying to do and can help because I know it has to be something pretty simple to do.

Thanks so much,
Sindy