If the discount on a certain sum in 2 years at a certain rate is $ 150 and the interest in 3 years is $ 240. Find the sum and the rate of interest.

• $ 2400, 3 1 % 3
• $ 2400, 4 1 % 3
• $ 2200, 5 1 % 3
• $ 2000, 3 1 % 3