Music-Is-Us, Inc., is a supplier of musical instruments for professional and amateur musicians. The companys accountants make adjusting entries monthly, and they make all closing entries annually. The company is growing rapidly and prides itself on having no long-term liabilities.

The company has provided the following trial balance dated December 31, 2021.

MUSIC-IS-US, INC.
TRIAL BALANCE
DECEMBER 31, 2021
Cash at bank	$	48,000
Marketable securities		30,000
Accounts receivable		133,000
Allowance for doubtful accounts					$	5,200
Merchandise inventory		258,000
Office supplies		2,000
Prepaid insurance		6,160
Building and fixtures		1,797,000
Accumulated depreciation						794,000
Land		67,800
Accounts payable						65,000
Unearned customer deposits						7,800
Income taxes payable						73,000
Capital stock						940,000
Retained earnings						239,200
Unrealized holding gain on investments						5,100
Sales						1,686,520
Cost of goods sold		954,000
Bank service charges		160
Uncollectible accounts expense		8,000
Salary and wages expense		385,000
Office supplies expense		500
Insurance expense		6,300
Utilities expense		2,900
Depreciation expense		44,000
Income tax expense		73,000
	$	3,815,820			$	3,815,820

Other information pertaining to the companys trial balance is provided as follows.

1. The most recent bank statement reports a balance of $49,580. Included with the bank statement was a $2,200 check from Iggy Smarts, a professional musician, charged back to Music-Is-Us as NSF. The banks monthly service charge was $20. Three checks written by Music-Is-Us to suppliers of merchandise inventory had not yet cleared the bank for payment as of the statement date. These checks included: no. 508, $4,000; no. 511, $8,600; and no. 521, $8,000. Deposits of $16,800 reached the bank too late for inclusion in the current bank statement. The company prepares a bank reconciliation at the end of each month.

2. Music-Is-Us has a portfolio of marketable securities that originally cost $24,000. As of December 31, the market value of these securities was $32,200. All short-term investments are classified as "available for sale."

3. During December, $5,700 of accounts receivable were written off as uncollectible. A recent aging of the company's accounts receivable led management to conclude that an allowance for doubtful accounts of $7,800 is needed at December 31, 2021.

4. The company uses a perpetual inventory system. A year-end physical count revealed that several guitars reported in the inventory records were missing. The cost of the missing units amounted to $1,000. This amount is not considered significant relative to the total cost of inventory on hand.

5. At December 31, approximately $870 in office supplies remained on hand.

6. The company pays for its insurance policies 12 months in advance. Its most recent payment was made on November 1, 2021. The cost of this policy was slightly higher than the cost of coverage for the previous 12 months.

7. Depreciation expense related to the company's building and fixtures is $6,000 for the month ending December 31, 2021.

8. Although Music-Is-Us carries an extensive inventory, it is not uncommon for experienced musicians to order custom guitars made to their exact specifications. Manufacturers do not allow any sales returns of custom-made guitars. The entire sales amount is collected at the time a custom order is placed, and is credited to an account entitled Unearned Customer Deposits. As of December 31, $4,400 of these deposits remained unfilled because the special-order guitars have not been received from the manufacturer. The cost of goods sold and the reduction in inventory associated with all custom orders is recorded when the custom merchandise is delivered to customers. At that time, the adjusting entry requires only a decrease to unearned customer deposits and an increase in sales.

9. Accrued income taxes payable for the entire year ending December 31, 2021, total $82,000. No income tax payments are due until early in 2022.

a. Prepare a bank reconciliation to update the accounting records of Music-Is-Us as of December 31, 2021.

b-i. Prepare the necessary adjusting entries at December 31, 2021.