REVIEW: Use the following to answer questions 28 - 32 The company reports the following income statement results: Gross profit $289,440 Interest revenue 20,000 Sales discounts 13,000 Net Sales 720,000 Operating expense 266,200 Effective tax rate 20% 28. $ Calculate Sales. 29. $ Calculate Income before Income tax (IBT). 30. $ _Calculate net income. 31. % Calculate the gross profit margin (one decimal place) 32. % Calculate the profit margin (one decimal places)