A part of certain sum of money is invested at 9% per annum and the rest at 15% 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) 4:6
B) 4:9
C) 5:3
D) 4:1
E) 4:2
15:9   = 5:3   Answer: 5:3
<result>C</result>
A part of certain sum of money is invested at 9% per annum and the rest at 15% per annum, if the interest earned in each case for the same period is equal, then ratio of the sums invested is?