A company produces two types of can openers: manual and electric. Each requires in its manufacture the use of two machines:A, and B. Each manual can opener requires the use of machine A for 2 hours, and machine B for 1 hour. An electric can opener requires 1 hour on A, and 2 hours on B.Furthermore, suppose the maximum numbers of hours available per month for the use of machines A, B are 90, 60 respectively. The profit on a manual can opener is $2, and on an electric can opener it is $2.5. If the company can sell all the can openers it can produce, how many of each type should it make in order to maximize the monthly profit?