Bramble Corporations management wants to maintain a minimum monthly cash balance of $12,000. At the beginning of September, the cash balance is $18,405, expected cash receipts for September are $145,800, and cash disbursements are expected to be $172,500. How much cash, if any, must Bramble borrow to maintain the desired minimum monthly balance? Determine your answer by using the basic form of the cash budget.

I have everything except the amount of total available cash, which I put $12,000 and it said it was wrong. And how to find the borrowings.

Please and thank you!