AI year end, the unadjusted debit balance of allowance for doubtful accounts is $9,870. The annual credit sales to customers was $539,600. The company uses the percentage of sales method to estimate uncollectible accounts. Based on experience, 5% of credit sales are uncollectible Calculate the amount added to allowance to doubtful accounts during the year? Select one a $25.750 b. $27.160 Oc$28.970 d: $26.980 De 524420