net float

Tanner Tavern writes four checks a day for an average amount of $5,400 each. These checks generally clear the bank four days after they are written. In addition, the firm generally receives and deposits checks amounting to $18,700 each day. All deposits are available on the next day. What is the firm’s net float?
Options:
Net collection float of $13,200
Net collection float of $18,700
Net collection float of $22,300
Net disbursement float of $67,700
Net disbursement float of $86,400