Brown Office Supplies recently reported $15,500 of sales, $8,250 of operating costs other than depreciation, and $1,750 of depreciation. It had $9,000 of bonds outstanding that carry a 7.0% interest rate, and its federal-plus-state income tax rate was 40%. How much was the firm's interest expense?a. 4,627
b. 4,870
c. 5,114
d. 5,369
e. 5,638