48. If P = (q+12)/(q+5) is a demand equation, find the rate of change of price p with respect to quantity q.

50. If = 0.03q+1.2+3/q is an average-cost function, find the marginal cost when q = 100.

Please check if these all right thank you!

a. Textbook p.536, problem 48 8 marks b. Textbook p.536, problem 50, where c 0.03 q 1.2 is average cost in dollars per unit A CCX) and q is the production level in units (8 marks) p y at 2 the of p with respect to q d rate chang at 5) ACCA find marginal cost when q too uni