(a)The following table illustrates the output of a perfect competition firm that produces power banks.

(i)Calculate the missing variables in the table above. Show all working and label each variable correctly. (ii)Which period of production is the firm operating in? Provide a reason for your answer. (iii)Identify the range of output that the firm faces the law of diminishing marginal returns in production. Explain your answer. (iv)Calculate the optimal output and profit of the firm using the profit maximising condition. Use a relevant diagram to illustrate your answers and clearly shade the-area that represents the firm's profit.