Prince George Mining provides the following information about their diamond mine. The annual depletion expense is $450,000 and there were 1,000,000 units extracted and sold during the year. The total estimated units of production is 16,000,000 and the residual value is estimated to be $500.000. Determine the depletion base is for the resource. A. $7,200,000 B. $7,700,000 C. $35,555,555 D. $15,500,000