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 answer:
A) 4:8
B) 4:1
C) 4:3
D) 4:2
E) 4:7
12:9   = 4:3   Answer: 4:3
<result>C</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?