You take out a $15-$year FRM for $$500,000.$ The bank offers $5\%$ interest rate but charges you a loan fee of $5\%$ of the total loan amount. What is the actual cost of borrowing of this mortgage?

$0\mathrm{.}42\%$

$0\mathrm{.}48\%$

$5\mathrm{.}00\%$

$5\mathrm{.}79\%$