Mr$.$ Choi operates a news$-$stand. He orders copies of newspapers from the publisher at a cost of $$4$ per copy. From m any years of sales experience, he learned that the demand for newspaper depend on the price. In particular, he has discovered that the demand can be described with a normal distribution with mean $100-$ p and standard deviation $12.$ Any unsold newspapers at the end of the day has zero salvage value.

Q$14$

Suppose that the retail price p is fixed at $$10.$ What is the optimal order quantity? Choose the closest number.

a$.87$

b$.93$

c$.96$

d$.84$

C$.90$

Q$1$price p does the optimal order quantity achieve the se twice level of $80\%?$