Annual credit sales of Nadak Co. total $336.6 million. The firm gives a 1.75% cash discount for payment within 10 days of the invoice date: 80% of Nadak's accounts receivable are paid within the discount period. Required: a. What is the total amount of cash discounts allowed in a year? (Enter your answer in millions rounded to 2 decimal places.) Answer is complete and correct. $ 4.71 million amount b. Calculate the approximate annual rate of return on investment that Nodak Co's cash discount terms represent to customers who take the discount. (Assume a credit period of 30 days and 360 days year). (Round intermediate calculations to 2 decimal places. Enter your answer as a percentage rounded to 1 decimal place (le, 32.1).) Answer is complete but not entirely correct. ROI 32.1