Compute the Return on Assets Managed (ROAM) for Each Segment

Compute the Return on Assets Managed (ROAM) for each segment of the business using the following data:
Accounts receivable = $3,000,000
Inventory = $7,000,000
Contribution margin = $2,000,000
Sales = $5,000,000

A) 0.5
B) 0.4
C) 0.2
D) 0.3