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The J&B Card Shop sells calendars featuring a different colonial picture for each month. The once$-$a$-$year order for each year's calendar arrives in September. From past experience, the September$-$to$-$July demand for the calendars can be approximated by a normal distribution with $=320$ and standard deviation $=18.$ The calendars cost $$4\mathrm{.}50$ each, and $J$&$B$ sells them for $$16$ each. Use Appendix $A$ to determine $z-$value. Round $z-$value to two decimal places. Do not round any other intermediate calculations. Round your answers to the nearest whole number.

a$.$ Suppose that J&B throws out all unsold calendars at the end of July. Using marginal economic analysis, how many calendars should be ordered?

calendars

b$.$ If J&B sells surplus calendars for $$1$ at the end of July and can sell all of them at this price, how many calendars should be ordered?

calendars