4. Delta Ltd. Had the following information available regarding last year's operations: Sales (10.000 units): 100.000 euro Variable costs: 20.000 euro Contribution margin: 80.000 euro Fixed costs: 10.000 euro Net income: 70.000 euro If sales were to decrease by 1.000 units, what would be the effect on net income? a. Net income would increase by 8.000 euro. b. Net income would decrease by 8.000 euro. C. Net income would decrease by 1.000 euro. d. Net income would decrease by 10.000 euro