Dartmouth Company produces a single product with a price of $12, variable cost per unit of $3, and total fixed cost of $7,200. The variable cost ratio and the contribution margin ratio for Dartmouth are a.80% and 80%, respectively. b.20% and 80%, respectively. c.25% and 75%, respectively. d.75% and 25%, respectively. e. The contribution margin ratio cannot be determined from the information given.