You own an oil pipeline that will generate a $$2\mathrm{.}5$ million cash return over the coming year. The pipelines operating costs are negligible, and it is expected to last for a very long time. Unfortunately, the volume of oil shipped is declining, and cash flows are expected to decline by $4\mathrm{.}0\%$ per year. The discount rate is $9\%.$a$)$ What is the present value of the pipelines cash flows if its cash flows are assumed to last forever?b$)$ What is the present of the cash flows if the pipeline is scrapped after $19$ years?