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Mr. X has invested a part of his investment in 10% bond A and a part in 15% bond B. His interest income during first year is Rs. 4000. If he invests 20% more in 10% bond A and 10% more in 15% bond B, his income during the second year increases by Rs. 500. Find his initial investment and the new investment in bond A and B, using matrix method.

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This looks like homework, so I added the homework tag. If it is not homework, feel free to remove it. And welcome to the site! –  Peter Flom Jan 27 '13 at 15:08
    
What did you try? –  Thierry Silbermann Jan 27 '13 at 15:57
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