The Katie's Card Shop sells calendars with different Colonial pictures shown for each month.

The once$-$a$-$year order for each year's calendar arrives in September. From past experience the

September to March demand for the calendars can be approximated by a normal distribution

with mean $400$ and standard deviation $100.$ The calendars cost $$2$ each, and Katie sells them

for $$3$ each.

a$)$ If Katie throws out all unsold calendars at the end of March $($i$.$e$.,$ salvage value is zero$),$ how

many calendars should be ordered?

f Katie reduces the calendar price to $ $0\mathrm{.}5$ at the end of March and can sell all surplus

calendars at this price, how many calendars should be ordered? show me how to solve this step by step in excel you are talking to a stupid person I need you to tell me in Cell A$1$ what to enter and so forth