Cemalock produces and markets solid oak furniture. Each bookcase requires 20 board feet of oak lumber plus fittings, which cost $50. Oak lumber costs $15 per board foot. Direct labour is paid $25 per hour, and it takes four hours to make each bookcase. The workshop in which the bookcases are made is rented at $2,000 per month. Depreciation of plant and equipment costs $100 per month. Other production and administrative overhead (all of which is fixed cost) is $5,400 per month. Each bookcase is sold for $950. Average monthly sales are 20 bookcases. (20 marks) Required SHOW ALL CALCULATIONS: (a) Calculate the following: (i) Variable cost per bookcase (ii) Contribution margin per bookcase (iii) Total fixed cost per month (iv) Monthly break-even point in units (v) Monthly break-even point in sales dollars (vi) Monthly operating profit (b) How many bookcases must be sold to make an operating profit of $5,000? (c) If the company spent an additional $1,000 on advertising, how many additional bookcases would the company need to sell to make it worthwhile? (d) If the company increased its price from $950 to $1,000 and sales numbers fell from 20 to 18, would this be worthwhile? (e) If the company decreased its price from $950 to $800 and sales numbers increased from 20 to 25, would this be worthwhile?