Susan is having a bakery in the heart of the city and supplies special type of cheese cookies to all the retail outlets based on the demand. Her cost of making each box of cookies is 15 SAR and she sells it at 18 SAR. The historical data shows that her demand is normally distributed with a mean of 250 boxes per day with a standard deviation of 22 boxes. All those boxes that are not picked up on the same day by the retailers are sold in her own shop at 10 SAR on the next day. What is the optimal stocking level?

Rate of return douglas keel, a financial analyst for orange industries, wishes to estimate the rate of return for two similar-risk investments, x and y. douglas's research indicates that the immediate past returns will serve as reasonable estimates of future returns. a year earlier, investment x had a market value of $27 comma 000; and investment y had a market value of $46 comma 000. during the year, investment x generated cash flow of $2 comma 025 and investment y generated cash flow of $ 6 comma 770. the current market values of investments x and y are $28 comma 582 and $46 comma 000, respectively. a. calculate the expected rate of return on investments x and y using the most recent year's data. b. assuming that the two investments are equally risky, which one should douglas recommend? why?