Milk is stocked at the grocery store each week. At the end of the week unsold milk is reduced in price by 50% of its selling price, and always sells for this lower price instantly. Weekly demand for...

Milk is stocked at the grocery store each week. At the end of the week unsold milk is reduced in price by 50% of its selling price, and always sells for this lower price instantly. Weekly demand for milk is normally distributed with a mean of 200 gallons and standard deviation of 25 gallons.  Each gallon of milk costs $1.75.  Assuming a service level of 90% and that the store sells the milk for $3 per gallon, how many gallons should the store order this week?