Brianna has preferences for milkshakes in the summer such that her total utility is maximized at 20 milkshakes consumed. When the price of a milkshake is $4 Brianna optimally consumes 14 milkshakes. Represent Brianna's preferences graphically by plotting her total utility curve, marginal utility curve, and total net utility curve. Assume that Brianna's preference abide by the law of diminishing marginal utility. Make sure all the curves line up properly and label the key points. Make sure you label the horizontal and vertical axes and the key points correspond to the correct values.