From 1980 to 1989, total consumption of fish in the country of Jurania increased by 4.5 percent, and total consumption of poultry products there increased by 9.0 percent. During the same period, the population of Jurania increased by 6 percent, in part due to immigration to Jurania from other countries in the region.
If the statements above are true, which of the following must also be true on the basis of them?
A. During the 1980's in Jurania, profits of wholesale distributors of poultry products increased at a greater rate than did profits of wholesale distributors of fish.
B. For people who immigrated to Jurania during the 1980's, fish was less likely to be a major part of their diet than was poultry.
C. In 1989 Juranians consumed twice as much poultry as fish.
D. For a significant proportion of Jurania's population, both fish and poultry products were a regular part of their diet during the 1980's.
E. Per capita consumption of fish in Jurania was lower in 1989 than in 1980.
The correct answer choice is WHAT MUST BE TRUE.
Answer choice
E:
Per capita consumption of fish in Jurania was lower in 1989 than in 1980.
Let f = total fish consumption in 1980 and t = total population in 1980.
Per capita consumption of fish means the average amount of fish consumed by each person.
In 1980, per capita consumption of fish = f/t.
In 1989, the total fish consumption increases by 4.5% and the total population increases by 6%.
Per capita consumption of fish in 1989 = (1.045f)/(1.06t).
(1.045/1.06)(f/t) < f/t.
1989 < 1980.
Thus, answer choice
E is WHAT MUST BE TRUE.
The correct answer is
E.
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