Atextbook costs $108.00. if matthew paid a total of $113.94 for the book and sales tax, what rate of sales tax was he charged, in a percentage ?

Matthew was charged 5.5% in sales tax.

Step-by-step explanation:

The percent change of an item can be found using the following equation:

In the problem, the original cost of the textbook is $108.00 and the cost after tax is $113.94:

So, the rate of sales tax that Matthew was charged is 5.5%.