NEWSVENDOR MODEL Johnson Electronics sells electrical and electronic components through catalogs. Catalogs are printed once every two years. Each printing run incurs a fixed price os $25,000$ ?a variable production cost of $ $5$ ?per catalog. Annual demand for catalogs has normal distributed; mean of $16,000$ ?and standard deviation of $4,000.$ ?On average, each customer ordering a catalog generates a $ $35$ ?in sales. Assuming that Johnson wants only one printing run in each two $-$ year cycle $($ and leftovers of the previous cycle are worthless $),$ ?how many catalogs should be printed in each run?