$4\mathrm{.}4$ Pesto Restaurant must decide between two types of technology in its kitchen. Option $A$ is to use an induction oven process with a fixed cost of $$20,000$ and a variable cost of $$6\mathrm{.}51$ per meal. Option $B$ is to use a gas$-$fired oven process with a fixed cost of $$12,000$ and a variable cost of $$7\mathrm{.}86$ per meal. The average selling price per meal is $$18\mathrm{.}60.$