The table below represents the total utility derived by a Daystar University student from consumption of three goods, Kiwano (A), Managu (B) and Omena (C) by a student. The p of per unit of A, B and C are Ksh. 5, 3 and 2 respectively. No. of units Total Utility Total Utility Total Utility Consumed TUA TUB TUc 4 144 120 128 240 208 240 12 320 272 320 16 382 320 376 20 456 360 408 24 496 376 432 28 520 384 448 a) Determine the marginal utilities for each good b) Find the optimal quantities of each good for consumption c) Find the total expenditure at the optimal level of consumption