Perez company purchased an ore mine for $3,920,000. it incurs extra cost of $1,097,600 to access the mine., which is estimated to hold 2,800,000 tons of ore. 270,000 tons of ore are mined the first year. the estimated value of the land once the ore is removed is $560,000. What is the amount of depletion, the depletion per unit and the depletion expense