Please, solve with Excel and provide step by step procedure and formulas.

Action Adventures The Adventure Toys Company manufactures a popular line of action figures and distributes them to toy stores at the wholesale price of $10 per unit. Demand for the action figures is seasonal, with the highest sales occurring before Christmas and during the spring. The lowest sales occur during the summer and winter months Each month the monthly "base" sales follow a normal distribution with a mean equal to the previous month's actual "base" sales and with a standard deviation of 500 units. The actual sales in any month are the monthly base sales multiplied by the seasonality factor for the month, as shown in the subsequent table. Base sales in December 2010 were 6,000, with actual sales equal to (1.18)(6,000) 7,080. It is now January 1, 2011 Month Seasonality Factor Month Seasonality Factor January 0.79 0.74 February 0.88 August 0.98 March 0.95 September 106 April 1.05 October 1.10 May 1.09 November 1.16 June 0.84 December 1.18