Is there any free app calculating total price of the goods in stock?

December 30, 2013 at 11:07PM:

It has to be linked to date so that I know how much goods have been purchased and how much I have spent on them. I only have 40 items in my stock and everyday the price is different so by the end of the month I don’t know how much I have actually spent and what is the average price. It would be very useful if this app had and exporting feature of the data (excel or smth). Thanks everybody!

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