Posted by Mk on Friday, October 12, 2012 at 7:24pm.
It's just 0.05 x 0.05 = 0.0025. The fact that they were both sold during a given hour is irrelevant to the calculation, BUT you're assuming when you perform that calculation that the returning of one item is independent of whether or not another one is returned. Given that they were both sold within such a small interval of time, you might feel the need to question that assumption.
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