Question 178291
If $2000 is invested at 10% simple annual interest, how much should be invested at 12% annual simple interest so that the total yearly income from both investments is $5000? 
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Equation:
interest + interest = interext
0.10*2000 + 0.12x = 5000

Multiply thru by 100 to get:
10*2000 + 12x = 500000
12x = 480000
x - $40,000 (amt. that must be invested at 12%)
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Cheers,
Stan H.