My demand functions for goods 1 and 2 are 1(1, 2, ) and 2(1, 2, ). If x1(2,5,90) = 20, x2(2,5,90) = 10, x1(2,4,90) = 15, and x2(2,4,90) = 15, can you say anything about how I would rank the commodity bundles (20,10) and (15,15)?

(Hint: This problem requires no calculus, algebra, or even arithmetic; just a little thinking.)