From a filtered list, need to get avg of values from data on 2 other columns

Hi there... I can use excel on a basic level so I'm challenged here to use the correct terminology to describe my excel issue. I'm trying to do some analysis on data for a friend. I have a few pieces of data I'm trying to get so I'll start with the first one. All help will be gratefully appreciated.

From a filtered list of Type=P (Column G), I'm trying to get an average of total prices (column F) based on multiple rows of matching Invoice (Column A).

The data detail is line item invoice detail. I want to get an average for all invoices for amount and qty. An invoice can have multiple rows of detail (items) with different costs and quantities. The data shows 8 unique invoice numbers. I'm trying to get two numbers here but I believe the formula would be similar (_I believe_)

I've attached the file with calculations I've done by hand with the goal in the yellow boxes. Please let me know if I'm not clear enough.

Thanks so much in advance.
Hiro


qtyprice-avg.xlsx

qtyprice-avg.xlsx