The adjusted cash balance per the books on September 30 is b. $6,980. Therefore , b. $6,980 is correct .
Here's how we can arrive at the answer:
Start with the cash balance per company books on September 30: $6,270.
Add the deposits in transit at month-end: $1,310.
Add the note receivable and interest collected by the bank on Marks' behalf: $760.
Subtract the outstanding checks at month-end: $630.
Subtract the bank charge for printing new checks: $50.
Subtract the check given to Marks during the month by a customer that was returned by the bank as NSF: $490.
So, the calculation is as follows:
$6,270 + $1,310 + $760 - $630 - $50 - $490 = $6,980
Therefore, the adjusted cash balance per the books on September 30 is $6,980.