$6$s$.4$ Y$5$u are considering a project with the following financial data:

Required initial investment at $n=0$ : $$50M$

Project life: $10$ years

Estimated annual revenue: $$x($unknown$)$

Estimated annual operating cost: $$15M$

Required minimum return: $20\%$ per year

Salvage value of the project: $15\%$ of the initial investment

What minimum annual revenue $($in $$M)$ must be generated to make the project worthwhile?

$($a$)x=$$$26\mathrm{.}64M$

$($b$)x=$$$28\mathrm{.}38M$

$($c$)x=$$$32\mathrm{.}47M$

$($d$)x=$$$35\mathrm{.}22M$