I only need the last one

A mail-order firm processes 5,900 checks per month. Of these, 60 percent are for $49 and 40 percent are for $81. The $49 checks are delayed two days on average; the $81 checks are delayed three days on average. Assume 30 days in a month. a-1. What is the average daily collection float? (Do not round intermediate calculations.) Answer is complete and correct. Average daily collection float $ 30,680 a-2. How do you interpret your answer? (Do not round intermediate calculations.) Answer is complete and correct. On average, there is 30,680 that is uncollected and not available to the firm. b-1. What is the weighted average delay? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) Answer is complete and correct. Weighted average delay 2.52 days b-2. Calculate the average daily float. (Do not round intermediate calculations.) Answer is complete and correct. Average daily float $ 30,680 C. How much should the firm be willing to pay to eliminate the float? (Do not round intermediate calculations.) Answer is complete and correct. Maximum payment $ 30,680 d. If the interest rate is 7 percent per year, calculate the daily cost of the float. (Use 365 days a year. Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) Answer is complete and correct. Daily cost of the float $ 5.68 d. If the interest rate is 7 percent per year, calculate the daily cost of the float. (Use 365 days a year. Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) Answer is complete and correct. Daily cost of the float $ 5.68 e. How much should the firm be willing to pay to reduce the weighted average float to 1.5 days? (Do not round intermediate calculations.) Answer is complete but not entirely correct. Maximum payment $ 9,847 X