Question 1122749
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<pre>

Let x = amount at 8%, in dollars.

Then the amount at 3% is the rest (18000-x) dollars.



The interest from the 8% amount is 0.08*x  dollars.

The interest from the 3%   amount is 0.03*(18000-x)   dollars.



Your equation is


    <U>interest</U> + <U>interest</U>       = <U>total interest</U>,   or

    0.08*x   + 0.03*(18000-x) = 1190   dollars.


    x = {{{(1190 - 0.03*18000)/(0.08-0.03)}}} = 13000.


<U>Answer</U>.  The amount at 8% is $13000;  the rest  $18000-$13000 = $5000 is the amount at 3%.


<U>Check</U>.   0.03*5000 + 0.08*13000 = 11900 dollars.   ! Correct !
</pre>

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It is a typical and standard problem on investment.


To see many other similar solved problems on investment, &nbsp;look into the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/coordinate/lessons/Using-systems-of-equations-to-solve-problems-on-investment.lesson>Using systems of equations to solve problems on investment</A>

in this site.


You will find there different approaches &nbsp;(using one equation or a system of two equations in two unknowns), &nbsp;as well as 
different methods of solution to the equations &nbsp;(Substitution, &nbsp;Elimination).


Also, &nbsp;you have this free of charge online textbook in ALGEBRA-I in this site

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson>ALGEBRA-I - YOUR ONLINE TEXTBOOK</A>.


The referred lesson is the part of this online textbook under the topic &nbsp;"<U>Systems of two linear equations in two unknowns</U>".



Save the link to this online textbook together with its description


Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson


to your archive and use it when it is needed.