A mail-order firm processes 5,200 checks per month. Of these, 70 percent are for $42 and 30 percent are for $74. The $42 checks are delayed three days on average; the $74 checks are delayed four days on average. Assume 30 days in a month. How much should the firm be willing to pay to reduce the weighted average float to 1.5 days? (Do not round intermediate calculations.)