4. Rasiah's Garden of fruit is a firm selling fruits in a perfectly competitive market. Total fixed cost is RM50, and the wage for labour is RM5 per worker. The estimated output produced and cost are as follows: Labour Output (Kg usage of fruits) 0 10 12 20 17 30 24 40 33 50 44 60 57 70 a. Calculate the total variable cost, average total cost, average variable cost, marginal cost, total revenue and marginal revenue. b. If Rasiah's garden of Fruits sells a kilo of fruit for RM3.50, how many Kg of fruit (output) should the firm sell in order to maximise profits, and how much profits would the firm make