please please urgently solve the case study with details, please

Case Study: Accrual Accounting

Al-Nahda Legal Consultancy was established in the city of Riyadh and began practicing its work and providing its services to clients. On December 31, its account balances appeared in the trial balance as follows:

Al-Nahda Consulting Corporation Trial Balance Before Settlement On December 30, 2020
Account Name	Balance
	Debit	Credit
Cash	135000
Debtors	104,000
office supplies	4000
Advance rent	27000
Land	47000
buildings	300,000
Building Consumption Complex		155,000
creditors		163,000
service revenue provided		40,000
capital		106000
Withdrawals	8000
revenue of services		450,000
salary expenses	255,000
Rent expense	25,000
Miscellaneous expenses	9,000
Total	914,000	914,000

As accountants at Al-Nahda Consulting, you were assigned by the financial director to review and verify the correctness of the balances of all these accounts. Accordingly, after inventorying the accounts, the following information appeared:

1. The remaining office supplies at the end of the year are 1000 riyals.

2. The lease contract was renewed on October 1, 2020, and was paid in advance with a total of 27,000 riyals, for a period of nine months.

3. Depreciation expense on buildings has not been recorded for the current year 2020, and the useful life of the buildings is 25 years.

4. The staff works from Sunday to Thursday. The weekly wage is 5000 riyals.

5. Invoices have been sent to customers in the amount of 15,000 riyals for services provided to them, and their entitlement must be proven.

6. The Foundation had received 40,000 riyals in advance for consulting services provided regularly from July 1, 2020 to February 31, 2021.

Required:

1. Make the necessary adjustments entries, then post the entries to the ledger accounts and balance them.

2. Conducting trial balance after adjustments.

3. Preparing the income statement, equity statement and financial position statement for the year ended December 31, 2020.

4. Making closing entries with their relay to the ledger.

5. Explain to the management of the institution - with the help of approved scientific references - the concept of the accrual system and its importance, and compare the state of the company's accounts before and after the settlement entries. And the impact of using an accrual system on the validity of financial information, which contributes to helping users of this information to make a decision.