enny Corporation is considering replacing a technologically obsolete machine with a new state$-$of$-$the$-$art$-$numerically controlled machine. The new machine would

st $$270,000$ and would have a twelve$-$year useful life. Unfortunately, the new machine would have no salvage value. The new machine would cost $$44,000$ per

ear to operate and maintain, but would save $$85,000$ per year in labor and other costs. The old machine can be sold now for scrap for $$27,000.$ The simple rate of

turn on the new machine is closest to $($Ignore income taxes.$)$:

Multiple Choice

$31\mathrm{.}48\%$

$7\mathrm{.}61\%$

$15\mathrm{.}23\%$

$6\mathrm{.}85\%$