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. Chris Co$.\text{'}$s avoidable cost per surfboard is $\_$blank$\_.$

$\backslash$$$305$

$\backslash$$$280$

$\backslash$$$355$

$\backslash$$$330$