$8\mathrm{.}27.$ Rework problem $8\mathrm{.}12$ if the interest rate is $($a$)15\%$ per year, $($b$)25\%$ per year, compounded annually.

$8\mathrm{.}12.$ The ABC company is considering the purchase of a new sanding machine; machine models A and B are available. Both models have a five year life, and their cash flows are given in table $8-2.$ The interest rate is $10\%$ per year, compounded annually. Which model should ABC buy?

$($a$).$

$\backslash$table$[[$Table $8-2,,],[$Cash Flows$],[,$Model A$,$Model B$],[0,-$$$30000,-$$$30000$

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