Answer:
The United States could trade Canada 20 pounds of food for 17 televisions.
The US receives TV at a rate of 17/20 = 0.85 which is higher than their opportunity cost therefore, making a gain
While Canada receive TV at a rate lower than their economy can produce them (0.85<0.9090) thus, also making a gain
Step-by-step explanation:
US
100 television or 150 pounds of food
Opportunity cost: of TV 1.5 pounds of food
Opportunity cost of food: 2/3 of a TV
CANADA
300 televisions or 330 food
Opportunity cost: of TV 1.1 pounds of food
Opportunity cost of food: 90/99 of a TV
It is cheaper for canada to produce TV and cheaper for the US to produce food.