Answer:
We need to know how much money she handed the cashier, to be able to calculate the change she should get back.
Explanation:
3 x 2.98 = 8.94
1 x 4.99 = 4.99
2 x 3.99 = 7.98
5.99 + (5.99 x 0.06) = 6.35
8.94 + 4.99 + 7.98 + 6.35 = 28.26
(Did this in case you get hit with a part 2 and need to calculate it out) :)