4. Giger Company acquired a tract of land containing an extractable natural resource. Giger is required by the purchase contract to restore the land to a condition suitable for recreational use after it has extracted the natural resource. Geological surveys estimate that the recoverable reserves will be 5,000,000 tons. Giger estimates that they will be able to sell the land for $1,000,000 after restoration. Relevant cost information follows: Land Estimated restoration costs $7,000,000 1,500,000 If Giger maintains no inventories of extracted material, what should be the charge to depletion expense per ton of extracted material?