Task: Question Answering
Input (English): Problem: if $ 5,000 is invested in an account at a simple annual rate of r percent , the interest is $ 250 . when $ 15,000 is invested at the same interest rate , what is the interest from the investment ? 
Options: a ) $ 700 , b ) $ 850 , c ) $ 800 , d ) $ 750 , e ) $ 900
Output (English): d