Question 1161942
"One person invests,..."; "If your annual income is, ...";


Who is who?


If same person, then this works like a two-part mixture.


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Forget about "One person" and "your".  They are the same person (assumed), someone.


Someone invests $10000; part at 4% and the rest at 6% annual rate.  He earns $520 in one year of time.


x at 6% and 10000-x at 4%.   The income or interest from these investments was $520.


{{{0.06x+0.04(10000-x)=520}}}--------solve this.