a total of $21,000 is invested in two bonds that pay 4% and 7.5% simple interest. The bond with 7.5 % interest rate earned 6 times as much interest. as the bond with a 4 % interest. rate. how much is invested in each bond? what was the total interest earned?

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23-11-2014
Mathematics

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a total of $21,000 is invested in two bonds that pay 4% and 7.5% simple interest. The bond with 7.5 % interest rate earned 6 times as much interest. as the bond with a 4 % interest. rate. how much is invested in each bond? what was the total interest earned?

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mathdragon mathdragon · Answer 1 · 2014-12-01T07:51:46-05:00

mathdragon mathdragon

01-12-2014

21000=a+b
ax.075xt=6xbx.04xt
t cancels out
a=3.2b
21000= 3.2b+b
21000=4.2b
b=5000
a=16000

account with 7.5% had 16000 invested in it.
account with 4% had 5000 invested in it

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