Question $9$: A proposed investment of $$9000$ will produce annual revenues of $$4000.$ The

investment risk is how long the revenue stream will continue. The given estimate of

probabilities for the investment's duration appears reasonable.

Regardless of N$,$ there will be no salvage value, and a before tax rate of return of $15\%$ is

required. What are the expected present worth of the investment and its variance?

Determine the probability of positive present worth?