1. Collected $195 cash from customers for services performed in August. 2. Collected $525 cash from customers for services performed in September. 3. Billed customers $610 for services performed in September. 4. Performed $110 of services to customers who paid in advance in August. 5. Received $110 from customers in advance for services to be performed in October. (a) Calculate revenue for the month of September using the accrual basis of accounting. (Do not leave any answer field blank. Enter O for amounts.) 1. Collected $195 cash from customers for services performed in August. 2. Collected $525 cash from customers for services performed in September. 3. Billed customers $610 for services performed in September. 4. Performed $110 of services to customers who paid in advance in August.