Wanda's Pie is a start$-$up specializing in gluten$-$free pies. There are two varieties of pies being offered and they would like to add black

cherry into their product line. Management would like to achieve a total contribution margin of $$12,000.$ The contribution margin

ratios $($percentages$)$ have already been determined for all three pies and the revenues for the first two pies have been estimated. Solve for b