a. What is the relevant range? What role does the relevant range concept play in explaining how costs behave? Type your answer here (2 marks) I b. Kenso Ltd produces a single product, sunglasses, and estimated figures for the next 6 months production were as follows: Units Produced Total Cost October 3,800 $68,000 November 9,000 $80,000 December 11,000 $88,000 January 12,000 $90,000 February 8,000 $82,000 March 3,000 $70,000 Required: ii. Using the high-low method, estimate the linear relationship (apply the cost function). If Kenso, Ltd plans to produce 5,000 units in April, what should the total estimated costs? Provide one major advantage and one major disadvantage of using the high-low method. Hii