The answers to this question are computed in the same way as Marshallian demands, where the budget is time rather than money. You don't have to think of them in these terms to solve the problem, though. If you spend b hours per week studying biology, and 6 hours per week studying chemistry, then you expect your average grade of the two classes to be 50 10 b, =1007 g( c) 5b+9 c+6 If you only have H hours per week to split between biology and chemistry, how many should you spend on biology in order to maximize your average grade? Hours spent on biology: \\ iii If you have 15 hours per week to split between biology and chemistry, what's the best average grade of the two that you can get? Grade: Note: the "plugging in" method that we learned first works better here than Lagrange multipliers