Please help me solve part d and part e with an explanation on how to solve Thank you

Suppose we are analyzing the intertemporal allocation of oil. Assume a generation is 35 years, and we are concerned with only two generations. The demand and supply functions for oil in the present generation are given by: Demand: Qd = 200-5Pd Supply: Qs = 5PS where Q is expressed in millions of barrels and P is the price per barrel. Suppose that the marginal benefit function is expected to be the same for the next generation. But there is a discount rate of 4% per year, which for 35 years works out to be approximately equal to 4 = (1.04)35. Total oil supply for both generations is limited to 100 million barrels. d) Calculate the appropriate depletion tax per barrel in the current generation? e) Calculate the new market price of oil in the current generation after imposing tax