Final answer:
After subtracting the $10,000 write-off from the existing allowance account balance of $16,500 and calculating the needed $27,000 estimated uncollectible amount, Madison Corporation will need to increase its allowance for doubtful accounts by $20,500, as a result of the November 30 adjusting entry for bad debts.
Step-by-step explanation:
To answer the question regarding the adjustment to the allowance for doubtful accounts for Madison Corporation, we must first calculate the amount of the adjusting entry for bad debts. Madison Corporation uses 1.5% of net credit sales to estimate uncollectibles, so we must determine net credit sales which is total sales minus cash sales. In this case, total sales are $2,000,000 and cash sales are $200,000, which means net credit sales are $2,000,000 - $200,000 = $1,800,000. Applying the 1.5% rate to net credit sales, the estimated uncollectible amount is $1,800,000 × 0.015 = $27,000.
Prior to the adjustment, the Allowance for Doubtful Accounts has a balance of $16,500. Since Madison is writing off the Norris Corporation accounts receivable balance of $10,000, the allowance account will be reduced by that amount, leaving it at $6,500 ($16,500 - $10,000). After the adjustment, the allowance account should reflect the estimated uncollectible amount of $27,000. Therefore, the adjusting entry will be the difference between the current balance after write-off ($6,500) and the needed balance ($27,000), which is $27,000 - $6,500 = $20,500.
Thus, as a result of the November 30 adjusting entry to provide for bad debts, the allowance for doubtful accounts will increase by $20,500, not matching any of the provided options (a, b, c, or d).