I'm having a little trouble on my last assessment problem.
17) During a store sale, the regular price for jeans is discounted by $7. There is a state sales tax of 3%, and the $7 discount is applied before the sales tax is calculated.
a. Write an expression that shows the regular price r of jeans minus the $7 discount.

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

c. How much would you pay during the sale for jeans regularly priced at $24.99?

Question

I'm having a little trouble on my last assessment problem. 
17)	During a store sale, the regular price for jeans is discounted by $7. There is a state sales tax of 3%, and the $7 discount is applied before the sales tax is calculated.
a.	Write an expression that shows the regular price r of jeans minus the $7 discount. 

b.	Write a rule for the function p(r) that expresses the final price p of jeans with the discount applied and sales tax added. 

c.	How much would you pay during the sale for jeans regularly priced at $24.99?