Two goods are substitutes of each other if an increase in the price of one good causes the demand for the other good to increase

The above figure shows the production possibility frontier for a country. Suppose the country is producing at point A. What is the opportunity cost of increasing the production of rice to 12 tons?

A) 6 thousand bottles of wine B) 9 thousand bottles of wine C) 15 thousand bottles of wine D) 12 tons of rice E) Nothing, it is a free lunch.

Based on the data in the table above, the economy will be in short-run equilibrium at a price level of

A) 90. B) 110. C) 100. D) 120.