Presented below are a number of economic events. Using the format shown after the transactions, indicate whether the event (including its amount) increased (+), decreased (-), or had no effect (enter "O" or leave it blank) on each element of the accounting equation. 1. Purchased supplies on account, $260. 2. Provided a service on account, $680. 3. Paid salaries expense, $300. 4. Issued common shares in exchange for cash, $6,000. 5. Declared and paid $110 of dividends to shareholders. 6. Received cash from a customer who had previously been billed for services provided, $680 (see item 2). 7. Paid account owed to supplier on account, $260 (see item 1). 8. Paid for insurance in advance, $170. 9. Received cash in advance from a customer for services to be performed in the future, $330. 10. Performed the service that the customer previously paid for (see item 9). Use the following format. (If a transaction causes a decrease in Assets, Liabilities or Shareholders' Equity, place a negative sign (or parentheses) in front of the amount entered for the particular Asset, Liability or Equity item that was reduced. See Illustration 3.3 for example.)