What is the future value of a $1,000 annuity payment over five years if interest rates are 9 percent?

-recalculate the future value at 8 percent interest, and again, at 10 percent interest

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?