Use the following information to answer question 7 and 8. Econ Pty Ltd produced and sold 45 000 units of a single product last year. Data concerning the year's profit and loss statement are as follows: Sales revenue $1350 Manufacturing costs $585 000 Variable Fixed Selling costs $270 000 Variable $40 500 Fixed $54 000 Administrative costs Variable $184 500 Fixed $108 000 What was Econ's total contribution margin for the year? Select one: $720 000 O $762 330 $1134 000 $540 000 Assuming all cost relationships will remain constant for the coming year, how many units must be sold for the company to earn an after-tax profit of $180 000 if the income tax rate is 40 per cent? of Select one: 70 000 61 000 47 500 45 000