James wants to go buy a chocolate bar from a grocery store. The chocolate bar costs $5 and will have a 13% sales tax applied to
the transaction. At the cashier, he is told that the transaction will cost $6.78. Part a). Should James pay for the chocolate bar? Justify your answer.
Part b). What would be the base price of the chocolate bar such that it would cost $6.78 after the sales tax?
