The local supermarket buys mangos each day to ensure really fresh produce. Each morning, any mangos that are left from the previous day is given for free to farmers who use it feed their animals. This week, a deep freeze occurs and the supermarket can now buy fresh mangos at $15.00 each. The mangos are sold for $10.00 each. If there are not sold that day, they are all given to the farmers for free. Past history says that tomorrow’s demand for tomatoes is 1000 mangos with a standard deviation of 100 mangos. How many mangos should the supermarket purchase tomorrow?