Question 1130519
CDs:
Principal = p 
Rate = 0.045
Interest = 0.045p
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Bonds:
Principal = p + 20000
Rate = 0.046
Interest = 0.046(p + 20000) = 0.046p + 920
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Stocks:
Principal = 210000 - p - (p + 20000) = 190000 - 2p
Rate = 0.072
Interest = 0.072(190000 - 2p) = 13680 - 0.144p
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Total interest:
(0.045p) + (0.046p + 920) + (13680 - 0.144p) = 11420
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Simplify:
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-0.053p + 14600 = 11420
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-0.053p = -3180
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p = 60000
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From earlier:
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CDs:
Principal = p = 60000
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Bonds:
Principal = p + 20000 = 60000 + 20000 = 80000
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Stocks:
Principal = 190000 - 2p = 190000 - 120000 = 70000