Please show all calculations: Contribution Margin and Gross Margin Calculation Porter Company has provided the following data for the second quarter of the most recent year: Sales $300,000 Fixed Manufacturing Overhead $ 55,000 Direct Labour $72,500 Fixed Selling Expenses $46,250 Variable Manufacturing Overhead $41,000 Variable Administrative Expenses $ 48,000 Direct Materials $51,500 Fixed Administrative Expenses $44,500 Variable Selling Expenses $49,750 Assume that direct labour is a variable cost and that there was no beginning or ending inventories a) What was the total contribution margin of Porter Company for the second quarter? b) What was the gross margin (loss) for Porter Company for the second quarter