Float Management. A parent company settles the collection account balances of its subsidiaries once a week. (That is, each week it transfers any balances in the accounts to a central account.) The cost of a wire transfer is $10. A depository transfer check costs $.80. Cash transferred by wire is available the same day, but the parent must wait 3 days for depository transfer checks to clear. Cash can be invested at 12 percent per year. How much money must be in a collection account before it pays to use a wire transfer?