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Can anyone give me the 3 equations in general form that I need to solve this matrix?

A person will put 30% of his investment into a stock fund that earns a 9% annual rate of return. He will put 20% in precious metals currently growing at 40% and the remainder into bond funds earning 3%. His goal is to have $4000 of interest income. How much should he put into each investment?

One of the equations should be the equation for the statement about interest.

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# Help with an investment matrix word problem

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