Rojas Company purchased for $560,000 a mine estimated to contain 2 million tons of ore.the company paid for drilling 20,000$ and it expects to pay 20,000 as restoration cost .during 2015 the company extracted 500,000 tons and sold 200,000.the amount of inventory at the end of 2015 will be :

Select one: a. 150,000 b. 540,000 c. 60,000 d. 90,000