Crane Company produces flash drives for computers, which it sells for $20 each. Each flash drive costs $7 of variable costs to make. During April, 1000 drives were sold. Fixed costs for April were...

Crane Company produces flash drives for computers, which it sells for $20 each. Each flash drive costs $7 of variable costs to make. During April, 1000 drives were sold. Fixed costs for April were $1000. How much is the contribution margin ratio?