QUESTION 3 A restaurant serves soup and salad. The soup sales increase in winter and the salad sales increase in summer. Some summary statistics on the sales for each menu on a day are given below: 30 bowls of soups are sold per day on average, with a standard deviation of 3. 20 bowls of salads are sold per day on average, with a standard deviation of 4. Their covariance is -5. Suppose that a bowl of soup is 5 dollars, and a bowl of salad is 8 dollars. Determine the covariance between the revenues in dollars from soup and salads. O a. -225 O b.-300 O c. -250 O d. -200 O e. -100