1.8. (Lewis, 1996). Monthly bills in a household are received monthly (e.g., utilities and home mortgage), quarterly (e.g., estimated tax payments), semiannually (e.g., insurance) or annually, (e.g., subscription renewals and dues). The following table provides the monthly bills for next year. Month Jan Nov Feb. Mar. July Total Apr May June Aug. Sep. Oct. Dec. S 800 1,200 400 700 600 900 1,500 1,000 900 1,100 1,300 1,600 12,000 To account for these expenses, the family sets aside $1,000 per month, which is the average of the total divided by 12 months. If the money is deposited in a regular saving account, it can earn 4% annual interest, provided it stays in the account at least one month. The bank also offers three-month and six-month certificates of deposit that can earn 5.5% and 7% annual interest, respectively. Develop a 12-month investment schedule that will maximize the family total return for the year