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Karl invests $40000 into two different accounts with annual

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Karl invests $40000 into two different accounts with annual [#permalink] New post 02 Nov 2004, 15:27
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B
C
D
E

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Karl invests $40000 into two different accounts with annual interest rates x and y. After a year he got $4080 interest. Find rate x.
A. x=y*3/4
B. ratio of interst earned on x account to interest earned on y account is 3:2
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 [#permalink] New post 02 Nov 2004, 20:38
Let me try.
My vote is for D.
Each statement is sufficient.

What do others think?
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 [#permalink] New post 03 Nov 2004, 09:13
No. Each is not sufficent for sure. Try to write the equations.
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 [#permalink] New post 03 Nov 2004, 10:22
A*x/100 + (40000-A)y/100 = 4080

1. x=y*3/4

Since we have 3 variables (A, x and y) and two equations, Insuff.

2. (A*x/100)/[(40000-A)*y/100] = 3/2

Again two equations and 3 variables. Insuff.

combining we have 3 equations and 3 variables. Suff. so,C.
  [#permalink] 03 Nov 2004, 10:22
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