Multiply two columns and then sum based on multiple sheet in the same column

Hi,
I have workbook with 10 worksheet (Day1,Day2,Day3.....Day9,Day10) and 1 Sheet "Summary".

I need formula which Multiply two columns and then sum in "Summary" Sheet based on multiple sheet in the same column.

Thanks.

I feel that the multiplication could be done in each "Day" sheet individually then the sum calculated on the "Summary" sheet.
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Have you considered keeping all your daily data on a single sheet with an extra column to identify the day?

It seems to me that would be a lot more flexible and simplify any analysis, and of course you open up the stnadard Pivot Table functionality