Chris Co$.$ is currently producing $1,000$ surfboards annually. A supplier has offered to produce the boards for $\backslash (\backslash$$ $300\backslash )$ each. Chris Co$.$ incurs unit$-$level costs of $\backslash (\backslash$$ $280\backslash )$ per surfboard. Chris also spends $\backslash (\backslash$$ $25,000\backslash )$ on product design each year and incurs $\backslash (\backslash$$ $50,000\backslash )$ of facility$-$level costs. If Chris Co$.$ outsources the boards, they can lease their manufacturing space for $\backslash (\backslash$$ $12,500\backslash )$ per annum. Chris Co$.\text{'}$s relevant cost per surfboard is $\_$blank$\_.$

$\backslash$$$367\mathrm{.}50$

$\backslash$$$305\mathrm{.}00$

$\backslash$$$292\mathrm{.}50$

$\backslash$$$317\mathrm{.}50$