Assume that a manufacturer's variable cost per unit for a product is $10; the manufacturer sells the product to distributors for $20. The distributors sell the product to end-users for $25. What are the unit margin and percentage margin for the distributors?

	a.	$10 per unit margin with a 20% per unit percentage margin
	b.	$5 per unit margin with a 50% per unit percentage margin
	c.	$10 per unit margin with a 50% per unit percentage margin
	d.	$5 per unit margin with a 20% per unit percentage margin
	e.	$15 per unit margin with a 60% per unit percentage margin