Question: Jim has made his best affordable choice of muffins and coffee. He spends all of his income on 10 muffins at $1 each and 20 cups of coffee at $2 each. Now the price of a muffin rises to $1.50 and the price of coffee falls to $1.75 a cup.
a. Can Jim still buy 10 muffins and 20 coffees?
b. If Jim changes the quantities he buys, will he buy more or fewer muffins and more or less coffee? Expain your answer.