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2014-12-27T15:05:33+05:30

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We need to find the money invested.It is the principal. Let it be P.
Time = 1 year
Rate = 7.5%

he earned = $675
So interest = $675

interest = PTR/100

675= \frac{P*1*7.5}{100}  \\  \\ 675*100=7.5P \\  \\ 67500=7.5P\\  \\ P= \frac{67500}{7.5} =9000

So $9000 was invested.


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2014-12-27T17:42:51+05:30
Let the amount invested is principal amount= P
Rate of interest r=7.5/100
Time = t = 1
Interest earned= I = 675 $
We have I= P*r*t
           ⇒ 675 = P*7.5*1/100
           ⇒ P = 675*100/7.5
               P = 9000 $
Money invested was $ 9000
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