As of Monday Morning,the Ledger Balance and the Available Balance

As of Monday morning,the ledger balance and the available balance for a firm was $3,600.During the day,the firm wrote three checks in the amounts of $230,$590,and $870.The firm deposited a check for $350 and a check for $920.What is the amount of the collection float as of the end of the day?

A) $420
B) $580
C) $840
D) $1,270
E) $1,690