Soundex produces two models of clock radios. Model A requires 15 min of work on assembly line I and 10 min of work on assembly line II. Model B requires 12 min of work on assembly line I and 20 min of work on assembly line II. At most 21 hr of assembly time on line I and 20 hr of assembly time on line II are available each day. Soundex anticipates a profit of $12 on model A and $10 on model B. Because of previous overproduction, management decides to limit the production of model A clock radios to no more than 80/day

To maximize Soundex's profit, how many clock radios of each model should be produced each day? Find the range of values that the contribution to the profit of a model A clock radio can assume without changing the optimal solution. Identify the binding and nonbinding constraints.