At year-end, chief company has a balance of $10,000 in accounts receivable of which $1,000 is more than 30 days overdue. chief has a credit balance of $100 in the allowance for doubtful accounts before any year-end adjustments. using the aging of accounts receivable method, chief estimates that 1% of current accounts and 10% of accounts over thirty days are uncollectible. what is the amount of bad debt expense? a. $90.b. $190.c. $290.d. $100.