Worst Appliances provided the following information about its operations:

Variable manufacturing overhead - $10 per unit

Variable selling and admin costs - $16 per unit

Prime costs - $8 per unit

Fixed manufacturing costs - $900,000

Fixed selling and admin costs - $600,000

What is the contribution margin ratio if the company sells its only product for $80 each?

a) 67.5%, b) 57.5%, c) 42.5%, d) 32.5%