The local supermarket buys lettuce each day to ensure really fresh produce. Each morning any lettuce that is left from the previous day is sold to a dealer that resells it to farmers who use it to feed their animals. This week the supermarket can buy fresh lettuce for $6.00 a box. The lettuce is sold for $10.00 a box and the dealer that sells old lettuce is willing to pay $3.50 a box. Past history says that tomorrow's demand for lettuce averages 350 boxes with a standard deviation of 45 boxes. Question: how many boxes of lettuce should the supermarket purchase tomorrow? (Round the answer to integer) (8 points) Hint: apply the single-period inventory model to solve this