A manufacturer of scrapbook kits has a fixed cost of $$30,000.$ This manufacturer expects to sell $6,000$ scrapbooks for $$17\mathrm{.}50.$ This price will give the manufacturer a $20$ percent markup on price. Calculate the variable costs.

A$.$ $$6$

B$.$ $$5$

C$.$ $$8\mathrm{.}50$

D$.$ $$9$