A part of certain sum of money is invested at 9% per annum and the rest at 12% per annum, if the interest earned in each case for the same period is equal, then ratio of the sums invested is?	Choose the correct choice from the following answers:
A) 1:5 B) 2:3 C) 4:9 D) 4:3 E) 6:2
Explanation:   12:9   = 4:3   Answer: 4:3
<result>D</result>
A part of certain sum of money is invested at 9% per annum and the rest at 12% per annum, if the interest earned in each case for the same period is equal, then ratio of the sums invested is?