(viii). Calculate the Pre-tax Income. Sales - Total Operating Cost - Interest on Loans. (ix). Calculate the Tax. (x). Calculate the Profit: Pre-tax Income - Tax. (xi). Format the worksheet as follows: Make all the Totals bold, zero decimal places, comma, center the heading between A1:G1 and make it size 16, bold. (xii). Save the file as C:\\Exams\\Creative.xls