UP bookstore is trying to determine how many copies of Time magazine it should order each week. The manager believes that the demand for Time magazine is governed by the following discrete probability distribution:

The bookstore pays $ $0\mathrm{.}95$ ?for each copy of Time magazine and sells it for $ $2\mathrm{.}05.$ ?Each unsold copy can be returned for a revenue of $ $0\mathrm{.}45.$ ?How many copies of the Time magazine should the store order?