The graphical solution to the dessert problem indicates that the optimal solution contains both snack bars and ice cream because the slope of the total taste index line is between the slopes of the two constraint lines for calories and fat. With this in mind, consider changes in the taste index of snack bars, which is currently 85.

How large would this have to be for Maggie to consume all snack bars and no ice cream? How small would it have to be for Maggie to consume all ice cream and no snack bars? Answer in terms of slopes and which corner points would become optimal.