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Required B

Assume that more than one product is being sold in each of the four following case situations: $($Loss amounts should be indicated by sign.$)$

$\backslash$table$[[-,$Case $1,$Case $2,$Case $3,$Case $4],[$Sales$,$$$,442,000,,$$$,190,000,,,,,$$$,305,000,],[$Variable expenses,,$278,460,,,123,500,,,,,,91,500,],[$Contribution margin,,$163,540,,,,,,,,,,],[$Fixed expenses,,$114,000,,,69,000,,,473,000,,,,],[$Net operating income $($loss$),$$$,49,540,,$$$,(2,500),,$$$,103,460,,$$$,(12,500),],[$Contribution margin ratio $($percent$),,37,\%,,,\%,,82,\%,,,\%$