Consumer math please help.?

6c, 7b, 8b, 9c, 10b, 11b, 12b, 13T,14T, 15d, 16c, 17a and c, 18b, 19a, 20T, 21d, 22c, 23T, 24a, 25a, 26b, 27 ?, 28 d, 29 a.