Ellen wants to purchase a book that is regularly priced at $18. the book is discounted 15%. She also needs to pay a 6% sales tax on discounted price. What isn the total amount Ellen will pay for the book? pls explain to me if u find the answer

The equation represents the function f, and the graph represents the function g. f(x)=3(5/2)^x determine the relationship between the growth factors of f and g. a. the growth factor of g is twice the growth factor of f. b. the growth factor of f is twice the growth factor of g. c. the growth factor of f is 2.5 times the growth factor of g. d. the growth factor of f is the same as the growth factor of g.