A sum becomes Rs. 3000 at the rate of 12% per annum (simple interest). The same sumbecomes Rs. 3300 at the rate of 15% per annum (simple interest) in the same duration. Find thesum and the duration.

• A. rs. 2000 and 20 years
• B. rs. 1900 and 8.25 years
• C. rs. 1500 and 7 years
• D. rs. 1800 and 5.5 years