Rulo Den the management accountant, at Keechen & Moore is trying to estimate the fixed and variable costs of producing XT Coffee Mug, which is part of the company's kitchenware range. He has extracted the following information for the period April - December: Month Production Costs Administration Costs (5) No. of XT Coffee Mugs (units) Sales Support Costs ($) April 15,500 33,400 12,800 8,000 May 8,700 28,700 10,100 2,000 June 12,600 28,760 9,800 2,240 July 10,210 28,340 10,000 1,780 August 9,000 43,000 14,900 5,200 September 11,000 41,450 15,000 1,000 October 13,000 41.300 15,500 1,500 November 10,300 31,100 13,500 2,100 December 9,990 33,600 12,900 1,000 Required: a) Use the High-Low method identify the fixed production cost per month and the variable production cost per XT Coffee Mug. Show all calculations. b) Develop a formula/cost function to estimate the cost behaviour exhibited by the company's production costs and use this formula to predict the production costs if 11,500 XT Coffee Mugs are produced. Show all workings