Brown Office Supplies recently reported $18,000 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 earnings before taxes (EBT)? a. $8,033 b. $8,918 c. $5,749 d. $7,223 e. $7,370