Lamar has the following information

Selling Price $40

Variable manufacturing cost $22

Fixed manufacturing cost $150,000 per month

Variable selling & administrative costs $6

Fixed selling & administrative costs $120,000 per month

___________________________ 5. what is the contribution margin in dollars?

___________________________ 6. How much in sales dollars is required to generate an operating profit of $30,000?

___________________________7. what is the contribution margin ratio?

___________________________ 8. How much in units is required to generate an operating profit of $24,000 after tax ( tax rate 20%)