I need help in these 3 questions. Please make sure there is no plagiriasm. Write in your own words especially the first two questions. They are very hard, please do the questions carefully and perfect

Q1. Choose two accounting principles and two accounting assumptions and explain them in your word. Answer: Q2. Explain the concept of double entry system and its relationship with accounting equation. Q3. A1-Ahmad Accounting Services completed these transactions in July: a. Purchased office supplies on account, SAR 450 b. Completed work for a client on credit, SAR 1,500 c. Paid cash for the office supplies purchased in (a) d. Completed work for a client and received SAR 800 cash e. Received SAR 1,500 cash for the work described in (b). f. Received SAR 3,000 in advance from a client for accounting services to be performed in September. Prepare journal entries to record the above transactions. Explanations are not necessary