sumproduct function for weighted average

I am needing help with a SUMPRODUCT function. I do not understand it very well and what I put in doesn't look right.
On the grades worksheet, I need to find the weighted average in the total column. My formula doesn't look right.

This is for an online class I am taking and the teacher isn't responsive.

Any help is appreciated.

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Thanks for the title change

Im happy you got your question resolved, its always a good feeling when you can resolve the problem for yourself

We ask for thread title to be something descriptive of your problem (think google search terms?), because many members search our previous posts, and thread titles play a big part of the search. I doubt anybody would do a search based on your title?