An income statement for Sam's Bookstore for the first quarter of the year is presented below: Sam's Bookstore Income Statement For Quarter Ended March 31 Sales Cost of goods sold Gross margin Selling and administrative expenses Selling Administration Net operating income $910,000 565,000 345,000 $120,000 144,000 264,000 $ 81,000 On average, a book sells for $70 Variable selling expenses are $5 per book with the remaining selling expenses being fixed. The variable administrative expenses are 4% of sales with the remainder being fixed The contribution margin for Sam's Bookstore for the first quarter is