Patterson parkas companys sale revenue is $30 per unit variable costs are $19.50 per unit and fixed costs are $147000. a-compute Pattersons contribution margin per unit and contribution margin ratiob-determine the number of units Patterson must sell to break evenc-determine the sales revenue required to earn (pretax) income equal to 20% of revenue.d-how many units must Patterson sell to generate an after tax profit of $109200 if the tax rate is 35%e-Patterson is considering increasing its advertising expenses by $38500.How much of an increase in sales units is necessary from expanded advertising to justify this expenditure(generate an incremental contribution margin of $38500)