Question 3 (20 Points) (there is no connection between the segments) a. The prot function from selling x units is : $P(x)=1001nx 600 + 100x. Find the maximal average profit ner unit. (Decimals values of x can be rounded to the nearest integer (whole number)). b. A marketing manager has found that if he will advertise each month x minutes on Facebook and y minutes on Instagram, he will sell each month: f (x,y) = 100 + 3x + 15y + xy units when x,y >15. Choose a point (x, y) which is positioned on the curve f (x, y) = 2240 , nd x' =% for this curve at this point and explain its business related meaning. (You may also choose decimals and use two digits after the decimal point)