Mrs. Nelson is having a picnic for eighty relatives. Mrs. Nelson orders twenty dozen chocolate chip cookies from the tasty bakery. The tasty bakery uses eight ounces of chocolate chips for every two dozen cookies it bakes. The tasty bakery has two-pound bags of chocolate chips. How many bags of chocolate chips does the tasty bakery use for mrs. Nelson's order? The tasty bakery sells chocolate chip cookies for three dollars and twenty-ve cents per dozen. How much money does mrs. Nelson spend for the cookie order? Show all your mathematical thinking.