OBLA 0-7 A SU PE 10-7B Depletion Caldwell Mining Co, acquired mineral rights for $127,500,000. The mineral deposit is es mated at 425,000,000 tons. During the current year, 42,000,000 tons were mined and som a. Determine the depletion rate. b. Determine the amount of depletion expense for the current year. c. Journalize the adjusting entry on December 31 to recognize the depletion expense