13. A retailer deals in a perishable commodity. The daily demand and supply are variable. The data for the past 500 days show the following demand and supply:

The retailer buys the commodity at Rs 20 per kg and sells it at Rs 30 per kg. Any commodity remaining at the end of the day has no saleable value. Moreover, the loss (unearned profit) on any unsatisfied demand is Rs 8 per kg. Given the following pairs of random numbers, simulate six days' sales, demand, and profit.
(31, 18); (63, 84); (15, 79); (07, 32); (43, 75); (81, 27)
The first random number in the pair is for supply and the second random number is for demand viz. in the first pair (31, 18), use 31 to simulate supply and 18 to simulate demand. (CA, Nov. 2000)

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Supply Demand Availability (kgs) No. of days Demand (kgs) No. of days 10 20 40 10 50 50 20 110 30 190 30 200 40 150 40 100 50 70 50 40