complete both parts to the question

Your firm purchases goods from its supplier on terms of 1.9/15, net 30. a. What is the effective annual cost to your firm if it chooses not to take the discount and makes its payment on day 30? b. What is the effective annual cost to your firm if it chooses not to take the discount and makes its payment on day 40? a. What is the effective annual cost to your firm if it chooses not to take the discount and makes its payment on day 30? The effective annual cost is %. (Round to two decimal places.)