Basic math question, please help

Posted on 2013-11-18 16:34:00 in Math by JULIA

During a clothing store’s Bargain Days, the regular price for T-shirts is discounted by $5. There is a state sales tax of 5%, and the $5 discount is applied before the sales tax is calculated.



a. Write an expression that shows the regular price r of a T-shirt minus the $5 discount.



b. Write a rule for the function p(r) that expresses the final price p of a T-shirt with the discount applied and sales tax added.



c. How much would you pay during Bargain Days for a shirt regularly priced at $15.50?"



This is what I have:

a.) p = r - 5

b.) p(r) = r(0.5) - 5

c.) $18.25



Is that right?

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