Johnson electronics sells electrical and electronic components through catalogs. catalogs are printed once every two years. each printing run incurs a fixed cost of $25,000, with a variable production cost of $5 per catalog. annual demand for catalog is estimated to be normally distributed with a mean of 16,000 and standard deviation of 4,000. data indicate that, on average, each customer ordering a catalog generates $35 from sales. assuming that johnson wants only one printing run in each two-year cycle, how many catalogs should be printed in each run?