Below is a contribution format income statement for last month when Hill Corp. made and sold 10,000 units. Sales (10,000 units)..................$1,000,000 Variable Expense... ....600,000 Contribution Margin............. ..400,000 Fixed Expense....... ..250,000 Net operating income........ 150,000 If sales increase by 100 units, net operating income should increase by: Numeric Response