SOLUTION: Walt made an extra $5000 last year from a part-time job. He invested part of the money at 6% and the rest at 10%. He made a total of $420 in interest. How much was invested at 10%?
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-> SOLUTION: Walt made an extra $5000 last year from a part-time job. He invested part of the money at 6% and the rest at 10%. He made a total of $420 in interest. How much was invested at 10%?
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Question 265540: Walt made an extra $5000 last year from a part-time job. He invested part of the money at 6% and the rest at 10%. He made a total of $420 in interest. How much was invested at 10%? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = amount invested at 6%
Let = amount invested at 10%
given:
(1)
(2)
----------------------
Multiply both sides of (2) by
Then multiply both sides of (1) by
and subtract from (2)
(2)
(1)
And, since
He must invest $2000 @ 6% and $3000 @ 10%
