4 - Calculation of Contribution Margin Korara Company provides the following information for the period. Sales Variable Cost - Direct Materials Variable Cost - Direct Labour Variable Cost - Selling and Administration Expenses Fixed Factory Overhead Fixed Administration Costs Units Sold $687,500 151,250 302,500 13,750 125,000 45,000 55,000 Required: a) What is the expected profit from the sale of 55,000 units and at 65,000 units? b) What is the contribution margin per unit and contribution ratio (expressed as a %)