Product mix for maximum profit. A firm produces two types of earphones per year: x thousand of type A and y thousand of type B. If the revenue and cost equations for the year are (in millions of dollars)
![2266_Equation 8.jpg](https://secure.tutorsglobe.com/CMSImages/2266_Equation%208.jpg)
determine how many of each type of earphone should be produced per year to maximize profit. What is the maximum profit?