Romans sells the Regular blend for $$3\mathrm{.}60$ per pound and the DeCaf blend for $$4\mathrm{.}40$ per pound. Romans would like to Romans DeCaf coffee. The production cost is $$0\mathrm{.}80$ per pound for the Regular blend. Because of the extra steps require $($a$)$ Formulate a linear programming model that can be used to determine the pounds of Brazilian Natural and Colomb beans purchased to produce DeCaf, CR $=$ pounds of Colombian beans purchased to produce Regular $,$ and CD $=$ po