The local supermarket buys lettuce each day to ensure really fresh produce. Each moming. 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 $$5\mathrm{.}00$ a box. The lemuce is sold for $$15\mathrm{.}00$ a box and the dealer that sells old lettuce is imiling to pay $$1\mathrm{.}60$ a box. Past history says tha tomorrow's demand for lettuce averages $240$ boxes with a standard deviation of $36$ boxes.

How many boxes of lettuce should the supermarket purchase tomorrow?

Note: Use Excel's NORM SINV$0$ function to find the $z$ value Round your answer to the nearest whole number.

Answer is complete but not entirely correct.

Nimber of boves