Firm X's Total Fixed Costs Are $1,000

Multiple Choice

Firm X's total fixed costs are $1,000. Its total variable costs of producing 100 units are $2,000, and its total variable costs of producing 200 units are $4,000. What are its average costs of producing 100 and 200 units of output?

A) $30 and $25
B) $20 and $20
C) $10 and $5
D) $25 and $30