8. Sold 160 alarm systems for $580 each plus sales tax of 5 percent. All sales were on account. 9. Record the cost of goods sold related to the sale from Event 8 using the FIFO method. 10. Billed $120,000 of monitoring services for the year. Credit card sales amounted to $36,000, and the credit card company charged a 4 percent fee. The remaining $84,000 were sales on account. Sales tax is not charged on this service. 11. Replenished the petty cash fund on June 30. The fund had $11 cash and receipts of $65 for yard mowing and $24 for office supplies expense