Sam Wainwright is a new accountant with Ground Floor Company. Ground Floor purchased merchandise on account for $18,000. The credit terms are 1/10, n/30, Sam has talked with the company's banker and knows that he could earn 4% on any money invested in the company's savings account. Should Sam pay the invoice within the discount period or should he keep the $18,000 in the money market account and pay at the end of the credit period? Support your recommendation with a calculation showing which action would be best. (Use 360 days for calculation.) Dan take the discount as it will result in of $ If Sam forgoes the discount, it may be viewed as paying an interest rate of 1% for the use of $18,000 for 20 days. Calculate the annual rate of interest that this is equivalent to. (Round answer to 0 decimal places, e.g. 25%. Use 360 days for calculation.) Equivalent annual interest rate is