You own an oil pipeline that will generate a $$3\mathrm{.}5$ million cash return over the coming year. The pipeline$$s 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 $11\%.$

a$.$ What is the PV of the pipeline$$s cash flows if its cash flows are assumed to last forever? $($Enter your answer in dollars, not millions of dollars. Do not round intermediate calculations. Round your answer to the nearest whole dollar amount.$)$

b$.$What is the PV of the cash flows if the pipeline is scrapped after $15$ years? $($Enter your answer in dollars, not millions of dollars. Do not round intermediate calculations. Round your answer to the nearest whole dollar amount.$)$