(12 marks)4. An ice cream store has developed a seasonal index based on historical sales, to account for low demand during cold seasons and much higher demand during summer and hot seasons. Last year, the ice cream store had total annual sales of $750,000 and required 3600 tubs (11.4 litres) of ice cream. This store has two flavours chocolate and vanilla. The chocolate flavour has two times the sales of vanilla flavour. Forecast monthly purchases of chocolate and vanilla flavour tubs for the year. Month Seasonal Chocolate flavour Vanilla flavour forecast Index forecast purchase(tubs) purchase (tubs) Jan 0.28 Feb 0.46 Mar 0.78 Apr 1.01 May 1.15 June 2.25 July 2.34 Aug 1.24 Sept 0.92 Oct 0.83 Nov 0.46 Dec 0.28