The answer is P406,500. I just need the complete solution.

On January 2, 2016, Red Corporation purchased land with valuable natural ore deposits for P10 million. The estimated residual value of the land was P2 million. At the time of purchase. a geological survey estimated 2 million tons of removable ore were under the ground. Early in 2016, roads were constructed on the land to aid in the extraction and transportation of the mined are at a cost of P750300. In 2016, 50,000 tons were mined. In 2017, Red tired it: mining engineer and hired a new expert. A new survey made at the end of 2017 estimated 3 million tons of ore were available for mining. In 2017, 150,000 tons were mined. All the ore mine was sold. Compute the amount of depletion for 2017