Using composition of functions to determine discounts and sales tax of a product

Here is a question using a composition of functions to determine discounts and sales tax of a product. Now, I probably know how to determine this without having to apply composition of functions, but I'm a little stuck on applying them to this problem.

A store is offering a discount of 30% on a suit. There is a sales tax of 6%.

a. Using a composition of functions, represent the situation in which the discount is taken before the sales tax is applied.

b. Using a composition of functions, represent the situation in which the sales tax is applied before the discount is taken.

c. Compare the composite functions from parts a and b. Does one of them result in a lower final cost? Explain why or why not.

Any help or advice would be greatly appreciated!!

Thanks!