A business that charges $\$6$ for each unit of its product has these total costs. output level (units): $0,\;10,\;20,\;30$ overall costs ($\$$): $40,\;100,\;120,\;150$ Which statement is correct?
- AAverage cost is lowest when $10$ units are produced.
- BThe firm does not make any profit when $20$ units are sold.
- CThe firm has no fixed costs.
- DTotal variable costs fall continuously over these outputs.