keep getting this question wrong please help

For each transaction below, calculate the amount of revenue to be recognized in the current period using accrual basis accounting a. Performed $30,000 of services during the month and received full cash payment from customers at the time of service, Revenue to be recognized b. Performed $8,500 of services during the month and billed customers. Customers are expected to pay next month. Revenue to be recognized C. Received $17,000 cash from customers for services to be provided next month. Revenue to be recognized