Ellen wants to purchase a book that regularly priced at $18.the book is discounted 15%. She also needs to pay a 6% sales tax on the discounted price.

what is the totle amount Ellen will pay for the the book ?

If the discount is 15%....then the cost of the book without the tax must be 85% of what it normally cost

Also...if the tax is 6%, then she must multiply the discounted price by 1.06

So....the total cost of the book is 18 ( .85) (1.06) ≈ $16.22