Mendelev Company is a small producer of several coffee products. One of the products is Kapeng Barrack'o that is sold to retail outlets. Jensen Mendelev must decide how many boxes of the Kapeng Barrack'o to produce each month. The probability that the demand will be six boxes is 0.1, for seven boxes is 0.3, for 8 boxes is 0.5, and for 9 boxes is 0.1. The cost of every box is P400, and the price that Jensen gets for each box is P800. Unfortunately, any boxes not sold at the end of the month are of no value due to spoilage. How many boxes of Kapeng Barrack'o should Jensen produce each month?