$1-$ You own a gas pipeline that requires no maintenance and will produce $$2$ million of revenue next year. Unfortunately, after the first year, the volume of gas $($and thus the revenue$)$ is expected to decline by $4\mathrm{.}0\%$ per year.

$($a$)$ If the discount rate is $11\mathrm{.}0\%$ and the pipeline lasts forever, what is it worth today?

$($b$)$ If the pipeline is to be abandoned at the end of $20$ years, what is it worth today?

I only need answer to part $($b$)$