Answer:
He has to pay a sales tax of $40.46 Hope this helps!
Explanation:
First, keep this in mind, everytime that you have a percent, no matter what, MULTIPLY IT! So, you multiply $899 to the sales tax, 4.5%= 0.045, after that you get the product of 40.455. Since it's money, you have to Round it, 40.46. This is your sales tax (What he has to pay) 40.46