Hunter's, Inc. reported a balance of $1,410 in its cash account at the end of the month. There were $1,200 of deposits in transit and $1,150 of checks outstanding. The bank statement showed a balance of $1,510, service charges of $70, and the collection of a note plus interest. The note had a face value of $170. How much interest did the bank collect for the company?

$30

$390

$290

$50