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Travis has a savings account that his parents opened for him. It pays 6% annual interest. His uncle also opened an account for him, but it pays 8% annual interest. If there is $500 more in the account that pays 6%, and the total interest from both accounts is $114, how much money is in each of the accounts? PLEASE HELP

 Sep 21, 2014

Best Answer 

 #2
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Travis has a savings account that his parents opened for him. It pays 6% annual interest. His uncle also opened an account for him, but it pays 8% annual interest. If there is $500 more in the account that pays 6%, and the total interest from both accounts is $114, how much money is in each of the accounts? 

 

It depends on  how often the interest is paid but lets assume it is paid yearly, bank interest is compound interest.  

 

 

$interestfrom$8%$account$=I1=P(1.08)nP$interestfrom$%$account$=I2=(P+500)(1.06)n(P+500)I1+I2=P(1.08)nP+(P+500)(1.06)n(P+500)=114P(1.08)nP+(P+500)(1.06)n(P+500)=114P(1.08)nP+(P+500)(1.06)nP500=114P(1.08)n+(P+500)(1.06)n2P=614P(1.08)n+P(1.06)n+500(1.06)n2P=614P[(1.08)n+(1.06)n2]+500(1.06)n=614P=614500(1.06)n(1.08)n+(1.06)n2

 

THE 8% ACCOUNT HAS $P  AND THE 6% ACCOUNT HAS $(P+500)

This is saying that the original principals will depend on how long the money is invested for.   

-------------------------------------------------------------------------------

I'm just going to try it with a couple of values

1 YEAR

(614500×1.061)(1.081+1.0612)=600

Time 1 year,  amounts $600 and $1100       Interest = $48+$66=$114

-------------------------------------------------------

2 YEARS

(614500×1.062)(1.082+1.0622)=180

Time 2 years, amounts $180 and $680            Interest = $29.952+$84.048=$114

-------------------------------------------

3 YEARS

(614500×1.063)(1.083+1.0632)=41.0269608278163327

Time 3 years, amounts $41.0269 and $541.0269         etc

 

YES, THAT WORKS!

THAT QUESTION WAS  A BIT DIFFERENT FROM THE NORM.  

 Sep 21, 2014
 #2
avatar+118696 
+8
Best Answer

Travis has a savings account that his parents opened for him. It pays 6% annual interest. His uncle also opened an account for him, but it pays 8% annual interest. If there is $500 more in the account that pays 6%, and the total interest from both accounts is $114, how much money is in each of the accounts? 

 

It depends on  how often the interest is paid but lets assume it is paid yearly, bank interest is compound interest.  

 

 

$interestfrom$8%$account$=I1=P(1.08)nP$interestfrom$%$account$=I2=(P+500)(1.06)n(P+500)I1+I2=P(1.08)nP+(P+500)(1.06)n(P+500)=114P(1.08)nP+(P+500)(1.06)n(P+500)=114P(1.08)nP+(P+500)(1.06)nP500=114P(1.08)n+(P+500)(1.06)n2P=614P(1.08)n+P(1.06)n+500(1.06)n2P=614P[(1.08)n+(1.06)n2]+500(1.06)n=614P=614500(1.06)n(1.08)n+(1.06)n2

 

THE 8% ACCOUNT HAS $P  AND THE 6% ACCOUNT HAS $(P+500)

This is saying that the original principals will depend on how long the money is invested for.   

-------------------------------------------------------------------------------

I'm just going to try it with a couple of values

1 YEAR

(614500×1.061)(1.081+1.0612)=600

Time 1 year,  amounts $600 and $1100       Interest = $48+$66=$114

-------------------------------------------------------

2 YEARS

(614500×1.062)(1.082+1.0622)=180

Time 2 years, amounts $180 and $680            Interest = $29.952+$84.048=$114

-------------------------------------------

3 YEARS

(614500×1.063)(1.083+1.0632)=41.0269608278163327

Time 3 years, amounts $41.0269 and $541.0269         etc

 

YES, THAT WORKS!

THAT QUESTION WAS  A BIT DIFFERENT FROM THE NORM.  

Melody Sep 21, 2014

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