Use the slope-intercept formula to determine the annual increase in inventory and provide monthly seasonal indices for the given data Inventory demand in units Month Year 1 Year 2 Year 3 Year 4 Jan 55,200 39,800 32,180 62,300 Feb 57,350 64,100 38,600 66,500 Mar 15,400 47,600 25,020 31,400 Apr 27,700 43,050 51,300 36,500 May 21,400 39,300 31,790 16,800 Jun 17,100 10,300 31,100 18,900 Jul 18,000 45,100 59,800 35,500 Aug 19,800 46,530 30,740 51,250 Sept 15,700 22,100 47,800 34,400 Oct 53,600 41,350 73,890 68,000 Nov 83,200 46,000 60,200 68,100 Dec 72,900 41,800 55,200 61,100
