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A company is considering implementing a lockbox system. There is an annual fee of $6,570 plus a transaction fee of $0.05 per payment. The average size of customer payments is $3,175, and there are 31 payments made daily on average. The company can earn an EAR of 3.09% on its cash balances. For the lockbox system to be adopted with a positive NPV, by how many days should the average collection time be reduced at a minimum? Fractional answers are OK. (Assume 365 days in a year.) 2.11 2.17 2.23 2.29 O 2.35