North South Company plans to sell 5,000 books at $70 each in the coming year. Product costs include: Direct materials per book Direct labour per book Variable overhead per book $30 5 12 14,000 Total fixed factory overhead Variable selling expense is a commission of $2 per book. Fixed selling and administrative expense totals $15,400. a) Calculate the total variable cost per book. (3 marks) b) Calculate the total fixed expense for the year. (2 marks) Prepare a contribution margin income statement for the North South Company for the coming year. (7 marks)