Question 1116724
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<pre>
<U>interest</U>  + <U>interest</U> = <U>total interest</U>


0.05*(2x) + 0.04*x   = 420


0.1x + 0.04x = 420


0.14x = 420  ====>  x = {{{420/0.14}}} = 3000.


<U>Answer</U>.  $3000 was invested at 4%  and  $6000  was invested at 5%.


<U>Check</U>.   0.05*6000 + 0.04*3000 = 420.    ! Correct !
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Solved.