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?

Question

Mathematics

Elizabeth Wise

25 November, 18:12

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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Lamont Braun · Answer 1

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