a) Calculate the dollar amounts for each of the following costs: (i) Original purchase cost; (4 marks) (ii) Present cost; (4 marks) (iii) Current book value; (4 marks) (iv) Trade-in value; (4 marks) (v) Present market value. (4 marks) (b) Which of the costs or values in Question 4(a) should be used in the replacement analysis of SUMSONG1? State your reasons