A gift shop sells wrapper boxes for February 14. From his experience in previous years, the store owner knows that 150 boxes are sold with a standard deviation of 10 boxes. The cost of each box is $ 60.00 and he sells them for $ 90.00; If you do not sell them before February 14, you will have to auction them at a cost of $ 45. But, if they run out and a customer comes in and asks for more; You can buy them at a price of $ 100.00 each box with the competition.

How many boxes should you consider oversold?