Grace Ho notices that the balance recorded in her cheque book at the end of the month is $1,287, while the balance shown on her bank statement for the same date is $1,543. Examining the cheques listed on the bank statement, she sees that two cheques she wrote totalling $251 have not yet cleared the bank. Also, she notices that a cheque that she wrote for $86 that did clear was mistakenly recorded in her cheque book as $68. In addition, a $50 cheque given to her by a co-worker was returned for insufficient funds, and the bank charged her a $ 15 fee because of this cheque. The bank had also processed an electronic deposit of $100 to her account, which she had not yet recorded. Finally, the bank deducted a monthly service charge, but the bank statement is smeared and she cannot determine the amount of the charge.
Required:
Calculate the amount of the bank service charge.