Please answer number 8 only. Number 7 is DNE

7. [-/5 Points] DETAILS WANEFMAC7 15.3.030. MY NOTES Locate and classify all the critical points of the function. (HINT See Example 2. If an answer does not exist, enter DNE.) f(x, y) = xey ( x, y ) = Select Need Help? Read It Talk to a Tutor 8. [-/5 Points] DETAILS WANEFMAC7 15.3.045. MY NOTES PRACTICE ANOTHER Your company manufactures two models of speakers, the Ultra Mini and the Big Stack. Demand for each depends partly on the price of the other. If one is expensive, then more people will buy the other. If p, is the price of the Ultra Mini, and p2 is the price of the Big Stack, demand for the Ultra Mini is given by 91(P1/ P2) = 100,000 - 300p1 + 10p2 where q1 represents the number of Ultra Minis that will be sold in a year. The demand for the Big Stack is given by 92(P1, P2) = 150,000 + 10p1 - 300p2. Find the prices for the Ultra Mini and the Big Stack that will maximize your total revenue. (Round your answers to two decimal places.) P1 = $ P2 = $