If $5,000 is invested in an account at a simple annual rate of r percent, the interest is $250. When $20,000 is invested at the same interest rate, what is the interest from the investment?  Pick one.
A) $ 700 B) $ 750 C) $ 800 D) $ 1000 E) $ 900

Rationale: - > 250 / 5,000 = 5 % and 20,000 * 5 % = 1000 . thus , d is the answer .
Answer: D