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DLF is a retail mail order firm that currently uses a central collection system that requires all checks to be sent to its Boston headquarters. An average of 6 days is required for mailed checks to be received, 3 days for DLF to process them, and 2 days for the checks to clear through its bank. A proposed lockbox system would reduce the mailing and processing time to 2 days and the check clearing time to 1 day. DLF has an average daily collection of $150,000. If DLF adopts the lockbox system, its average cash balance will increase by