Final answer:
To calculate the accrued liability for product warranties at month-end, multiply the number of defective units sold by the average repair cost per unit.
Step-by-step explanation:
To calculate the accrued liability for product warranties at month-end, we need to consider the total sales, the number of defective units sold, and the average repair cost. In the first month, the total sales were $768,000. The number of defective units sold was 9. The average repair cost per unit is $200.
To calculate the accrued liability for product warranties, multiply the number of defective units sold by the average repair cost per unit. In this case, 9 defective units were sold, so the accrued liability for product warranties is 9 x $200 = $1,800.