2. Andrew's preferences for doing research and sleeping is U(x, y) = 6 . VS+ R, MUs = ), MUR =1, where R is number of hours spent on research and S is number of hours spent on sleep. Opportunity cost of sleeping and doing research is the same and equal 1 hour (ps = PR = 1). What's Andrew's optimal schedule if there is only 24 hours in a day (1 = 24) (a) S =0, R=0 (b) S =9, R =15 (c) S =24, R=0 (d) S =6, R=18 (e) None of the above