At Year-End, the Following Balances Appeared on the Ledger of a Company

At year-end, the following balances appeared on the ledger of a company prior to adjusting and closing it books. $\begin{array}{|l|l|}\hline \text { Accounts receivable } & \$ 110,500 \\\hline \text { Notes receivable } & 6,500 \\\hline \text { Allowance for doubtful accounts (credit) } & 520 \\\hline \text { Sales revenue } & 400,400(1 / 2 \text { on credit }) \\\hline \text { Sales returns and allowances } & 10,400(1 / 2 \text { on credit }) \\\hline \text { Advances to company officers } & 19,500 \\\hline\end{array}$ All receivables arose out of sales transactions except the advances to officers. The company's president estimated that 2 percent of outstanding customer receivables would not be collected. The controller believed that three-quarters of one percent of net credit sales would result in bad debts. How much should be debited to bad debt expense if:
(a) The president's estimate prevails? $__________________.
(b) The controller's view is accepted? $__________________.