The following master budget is provided: Sales: Per Unit= $60; Total= $900,000; Less variable costs (Man. costs & Selling and Admin. costs): Manufacturing costs per unit= $30; Manufacturing costs total= $450,000; Selling and administrative costs per unit= $10; Selling and administrative costs total= $150,000; So, Contribution margin: per unit= $20; Total= $300,000; Less fixed costs (Man. costs, Selling and admin. costs, and total fixed costs): Manufacturing costs total= $75,000; Selling and administrative costs total= $125,000; So, total fixed costs= $200,000; Net income= $100,000; What will be the overall volume variance (effect on net income) if 18,000 units are produced and sold? The answer is $60,000.How do you get this answer?