A part of certain sum of money is invested at 9% per annum and the rest at 18% per annum, if the interest earned in each case for the same period is equal, then ratio of the sums invested is?  Choose the most appropriate option.
A) 4:2	B) 2:1	C) 4:3	D) 4:0	E) 4:9
18:9   = 2:1   Answer: 2:1
<result>B</result>
A part of certain sum of money is invested at 9% per annum and the rest at 18% per annum, if the interest earned in each case for the same period is equal, then ratio of the sums invested is?