Can you please help with part a and b. thanks

Question 3. Make the appropriate journal entries for each part, assuming the company uses the accrual basis of accounting. The company's fiscal year ends on December 31. Each part counts four points, as if it were a separate question. Part a (four points) A car dealership sold a car for $48,000. (For the purpase of this question, we are dealing only with the sale of the carno warranty, no sales tax, etc.) The customer picked up the car on December 23. The customer paid $12,000 down (meaning he paid the car dealership $12,000 when he picked up the car), and the dealership allows him to pay the rest two months after the car was picked up. It is a bit unusual for the dealership to allow a customer to pay later, but the dealership owner grew up together with the customer, and the customer has bought eight cars from this dealership previously under the same financial arrangement Part b (four points). An accounting firm agreed to provide professional services to a client. The total fee is estimated to be $12,000 once all the services will have been provided, but as of the end of December, not all the services have yet been provided. The accounting firm estimates that 10% of the services have been provided. Nothing has yet been billed to the client, so the accounting firm plans to bill the client today for only the portion of the services that have actually been provided. Assuming the client is correctly billed, what is / are the appropriate journal entry or entries