13. Boom Company sold 4,500 units at a unit selling price of $85 per unit. The variables expenses per unit were $65 per unit, and the total fixed expenses were $30,000. If the dollar contribution per unit is increased by 10%, the total fixed expenses are reduced by 20%, and all other items remain the same, what will be the impact of these changes on net operating income? * The net operating income will decrease by $15,000 The net operating income will decrease by $75,000 The net operating income will increase by $15,000 The net operating income will increase by $75,000 None of the above