A manufacturer sells backpacks and tents The profit function for the manufacturer is a function z f x y where x is the quantity in thousands of backpacks that is sold y is the quantity in thousands of tents that is sold and z is in thousands of dollars Suppose that f 10 14 23 and fx 10 14 4 and fy 10 14 3 Estimate the profit obtained if the manufacturer sells 12 000 backpacks and 14 000 tents O a 3 000 b 4 000 O c 26 000 O d 27 000 O e 29 000 O f 31 000 O g 49 000 O h 50 000