A company purchased office equipment for $$56000$ and estimated a salvage value of $$8000$ at the end of its $8-$year useful life. The constant percentage to be applied against book value each year if the double$-$declining$-$balance method is used is $($Round answer to $1$ decimal place, e$.$g$.15\mathrm{.}2.)$

$2\mathrm{.}5\%.$

$8\mathrm{.}0\%.$

$12\mathrm{.}5\%.$

$25\mathrm{.}0\%$