Problem $4$: You invest $$10$ million into an oil pipeline that will generate a $$2$ million cash inflow over the coming year, and it is expected to grow with an annual growth rate of $2\%$ in the next $20$ years. However, the operation cost will be $$1$ million over the coming year, and is expected to growth at $1\%$ in the next $20$ years. Suppose at the end of $20$ year, you can sell the oil pipeline with the price of $$5$ million, what is the NPV of this pipeline project if the discount rate is $10\%.$this pipeline project if the discount rate is $10\%.$