$7-$P$.$ An office supply company has purchased a light duty delivery truck for $$18,000.$ The truck will be depreciated under the MACRS with a property class of five years. The truck's MV is expected to decrease by $$3,000$ per year. It is anticipated that the purchase of the truck will increase the company's revenue by $$10,000$ annually, whereas the associated operating expenses are expected to be $$3,500$ annually. The company has an effective income tax rate of $40\%,$ and its after$-$tax MARR is $15\%$ per year. If the company plans to keep the truck only two years, what would be the equivalent after$-$tax annual worth of this investment? $(7\mathrm{.}9)$