I am looking for help with the following questions, I have myself very confused with the credits/debits, can someone help with these study questions and explain how the answer is arrived at Would the answer for a) be $2,320?

Compute the ending balance in the allowance for uncollectible accounts after the adjusting entries have been prepared and posted for the following independent situations:

a) Credit balance in allowance for uncollectible accounts of $500 before adjustment. Net credit sales for the current year are $282,000 and 1% is considered uncollectible.

b) Debit balance in allowance for uncollectible accounts of $700 before adjustment. Net credit sales for the current year are $326,000 and 1.25% is considered uncollectible.

c) Credit balance in allowance for uncollectible accounts of $500 before adjustment. An aging schedule indicates $3100 of accounts receivables are uncollectible.

d) Debit balance in allowance for uncollectible accounts of $700 before adjustment. An aging schedule indicates $2660 of accounts receivables are uncollectible.