The correct answer is A. Rs. 19,900.
When a bill is discounted with a bank, the bank pays the drawer the face value of the bill less a discount. The discount is calculated based on the interest rate and the time until the bill matures. In this case, the face value of the bill is Rs. 20,000 and the discount is Rs. 100. Therefore, the bank pays X Rs. 19,900.
When a bill is dishonoured, the drawer must pay the bank the amount of the bill plus any interest and fees that have accrued. In this case, X must pay the bank Rs. 20,000. However, X has already received Rs. 19,900 from the bank when the bill was discounted. Therefore, X’s bank account will be credited with Rs. 19,900.
Option B is incorrect because it is the face value of the bill. Option C is incorrect because it is the face value of the bill plus the discount. Option D is incorrect because it is the face value of the bill minus the discount.