Rs. 12000 is divided into two parts such that simple interest on the first part for 3 years at 12%per annum may be equal to the simple interest on the second part for $$4\frac{1}{2}$$ years at 16%per annum. The ratio of the first part to the second part is=?

• A. : 1
• B. : 2
• C. : 3
• D. : 2