To determine which production outcome is not attainable based on the given production possibilities curve (PPC), we need to evaluate the provided options against the graph characteristics described.
- 20 tables and 0 benches - This point is on the curve (the endpoint of the last segment).
- 10 tables and 5 benches - This point seems to fall inside the curve and would be attainable (not on the curve but feasible).
- 0 tables and 20 benches - This point is not specified in the description of the curve, but since there is a segment from (0, 30) to (4, 24), and it likely goes down to (0, 0), this point could be attainable as well.
- 15 tables and 15 benches - This point does not correspond to any point detailed in the description of the PPC and likely exceeds the boundaries set by the curve given (as it may imply producing more than is possible with the combinations of tables and benches).
Based on the description, the most likely answer is 15 tables and 15 benches, which does not seem attainable based on the characteristics of the curve described.