A camera store sells an average of 100 cameras per month. The cost of holding a camera in inventory for a year is 30% of the price the camera shop pays for the camera. It costs $120 each time the...

A camera store sells an average of 100 cameras per month. The cost of holding a camera in inventory for a year is 30% of the price the camera shop pays for the camera. It costs $120 each time the camera store places an order with its supplier. The price charged per camera depends on the number of cameras ordered, as specified in the file P12_41.xlsx. Each time the camera store places an order, how many cameras should it order?