At the end of the current year, the accounts receivable account has a debit balance of $$1,140,000$ and sales for the year total $$12,920,000.$

The allowance account before adjustment has a debit balance of $$15,400.$ Bad debt expense is estimated at $3/4$ of $1\%$ of sales.

The allowance account before adjustment has a debit balance of $$15,400.$ An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $$49,300.$

The allowance account before adjustment has a credit balance of $$7,500.$ Bad debt expense is estimated at $1/2$ of $1\%$ of sales.

The allowance account before adjustment has a credit balance of $$7,500.$ An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $$62,300.$

Determine the amount of the adjusting entry to provide for doubtful accounts under each of the assumptions $($a through d$)$ listed above.

a$.$ $fill in the blank $1$

b$.$ $fill in the blank $2$

c$.$ $fill in the blank $3$

d$.$ $fill in the blank $4$