Answer:
a. <em>Credit balance in the Allowance for Doubtful Accounts and already balance in Allowance account = $300
</em>
<em>Estimated Doubtful accounts and balance maintained with Allowance for Doubtful Accounts= $8,500</em>
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Amount added to the Allowance for Doubtful Accounts = $8,500 - $300
Amount added to the Allowance for Doubtful Accounts = $8,200
Ending balance maintained with Allowance for Doubtful Accounts = $8,500
b.<em> Credit balance in the Allowance for Doubtful Accounts and already balance in Allowance account = $500
</em>
<em>Estimated Doubtful accounts and balance maintained with Allowance for Doubtful Accounts = $1,000,000 * 2% = $20,000</em>
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Ending balance maintained with Allowance for Doubtful Accounts = $20,000 + $500 = $20,500