The income statement of Oxford Corporation, a manufacturing company, included the following items:

Sales $1,800

Fixed selling expenses 180

variable selling expenses 140

direct labor 420

variable administrative expenses 60

fixed administrative expenses 120

direct materials used 340

fixed factory overhead 120

variable factory overhead 100

There were no beginning or ending inventories.

Calculate the following:

1. prime cost

2. conversion cost

3. total product cost

4. gross margin

5. total period cost

6. net income

7. total variable costs

8. contribution margin

9. total fixed costs

10. contribution margin ratio