Mark likes to have 1.5 portions of fries with each burger he eats. He does not eat burgers without fries nor fries without burgers. Let X be the quantity of portions of fries he consumes and Y the quantity of burgers. For simplicity assume that he can consume parts of portions of fries and parts of burgers. Suppose he has $12 to spend on fries and burgers. The price of a portion of fries is $1 and the price of a burger is $2.50. How many portions of fries and how many burgers will he buy? Question 7 options: X=5.75; Y=2.5 X=2.5; Y=3.8 X=2; Y=4 X=4.5; Y=3