If there were 3,750 more internet addicts this week than last week, by what percent has the number of internet addicts increased from last week to this week?
>(1) There are four times as many internet addicts this week as last week.
>(2) There are 5,000 internet addicts this week.

Correct.
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Stat. (1) gives the ratio of internet addicts from this week to last week. This is actually the percent change: four times as many addicts means an increase of 300% from the original. Therefore, **Stat.(1) → S → AD**.
Stat. (2) alone adds the number of internet addicts this week to the question stem. This gives you a starting point. You now have the
difference and the original, so therefore **Stat.(2) → S → D**.

Incorrect.
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If you figured out Stat. (1) is __sufficient__, you must remember
the percent change formula. What part(s) of this formula does Stat.
(2) provide?

Incorrect.
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You were right in that Stat. (2) provides all the parts that are
needed from the percent change formula. But what about Stat. (1)?
Try making sense of the data it gives you by using __Plugging In__.

Incorrect.
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You seem to understand percent change, but try to consider each statement alone. Isn't each statement __sufficient__ by itself?

Incorrect.
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Since the issue of this problem is percent increase/decrease, review
the percent change formula. Try to focus on the pieces of information
that are required to answer the question in each statement.

Statement (1) ALONE is sufficient, but Statement (2) alone is not sufficient to answer the question asked.

Statement (2) ALONE is sufficient, but Statement (1) alone is not sufficient to answer the question asked.

BOTH Statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.

EACH statement ALONE is sufficient to answer the question asked.

Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.