Suppose A Corp. completed the following investment transactions in 2020 and 2021:

2020
Nov.	6		Purchased 1,500 B Corporation common shares for $45,000. A plans to sell the shares in the near future to meet its operating cash flow requirements. Brokerage commissions on the purchase were $860.
	30		Received a quarterly cash dividend of $3.50 per share on the B Corporation shares.
Dec.	31		Current fair value of the B common shares is $49,500. This is year-end for A Corp.
2021
Jan.	20		Sold the B Corporation shares for $51,500, less brokerage commissions on the sale of $940.

January 20, 2021. Sold the B Corporation shares for $51,500, less commissions on the sale of $940.

Journal Entry
Date		Accounts	Debit	Credit
2021
Jan.	20	Cash
		Brokerage Commissions Expense	940
		Fair Value Valuation Allowance

Need detail explanations about how to calculate each steps and what is the answer for the rest two entries.