ABC Ltd produces Two products X and Y. The original budgeted details for a forthcoming period are as follows. X Y Sales units 1,000 1,100 Sales $ 50,000 66,000 Direct material $ 8,000 13,200 Direct labour $ 20,000 24,750 Variable overhead $ 8,000 10,560 Fixed overhead $ 6,000 9,000 Direct labour is paid at a rate of $5 per hour. After consideration of the above, the board of directors have now made the following changes: Because of a skill shortage, direct labour will be limited to 6,450 hours in the period; and, with an advertising campaign costing $4,000 for the period, sales of each product can be increased by 20%. Required: (a) Explain what is meant by a limiting factor of production. (3 marks) (b) Calculate the profit for the original budget. (7 marks) (c) Calculate the revised profit (after the directors changes) with direct labour as the limiting factor of production, if the advertising campaign goes ahead, resulting in the predicted increase in sales. (Work to the nearest $.) (12 marks) (d) Calculate the increase in profit in (c) that would arise if an extra 500 direct labour