Use the table to answer the following questions:

Quantity of yams(kg)	Total Revenue (TR)	Marginal Revenue (MR)	Total Cost (TC)	Marginal Cost (MC)
	N	N	N	N
0	0	-	5	-
1	9	9	8	3
2	18	9	6	T
3	24	6	21	5
4	28	Q	25	4
5	30	2	25	U
6	P	1	25	0
7	28	-3	S	1
8	24	R	24	-2

(a) Complete the table by calculating the missing figures P,Q,R,S,T,U.
(b)At what out-put is profit maximized?
(c) Calculate the profit when quantity sold is 5.
(d) At what output does MC begin to rise?