A camera store sells an average of 100 cameras per month. The cost of having a camera in inventory during a period is 30% of the price the store pays for the camera. It costs the store $120 dollars each time the store places an order with its supplier. The price to pay per camera depends of the number of cameras ordered. Each time the camera store places an order, how many cameras will should they ask? at what price should he pay them?

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