Skinner’s Fish Market buys fresh Boston bluefish daily for $4.40 per pound and sells it for $5.50 per pound. At the end of each business day, any remaining bluefish is sold to a producer of cat food for $1.40 per pound. Daily demand can be approximated by a normal distribution with a mean of 160 pounds and a standard deviation of 40 pounds. What is the optimal order quantity?