Question

Julio bought several books from the Coming-Around-Again Bookstore. He paid $31.80, including 6% sales tax. He then discovered that he should have been charged $2.50 instead of $4.00 for one of the books. How much should Julio have been charged, including tax?
A. 30.06
B.30.21
C.30.30
D.30.45

Answer 1

C is the answer all you had to do was
31.80-4.00
Which is 27.80
Then add 2.50
Which is 30.3!