Write a System of Equations for the Problem, and Then

Multiple Choice

Write a system of equations for the problem, and then solve the system.
-Paul invested twice as much money in an account paying 6% interest than he did in an account paying 3% interest. If the total interest paid was $ 300, how much did he invest in each?

A) $ 40 at 6%, $ 20 at 3%
B) $ 2000 at 6%, $ 4000 at 3%
C) $ 4000 at 6%, $ 2500 at 3%
D) $ 4000 at 6%, $ 2000 at 3%