victor has invested $4000 into two accounts, part at 5% simple interest and part at 9% simple interest. Find how much he invested at each rate if the total interest after 1 year is $311.
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Victor has invested $4000 into two accounts, part at 5% and part at 9%.
Find how much he invested at each rate if the total interest after 1 year is $311.
He invested dollars at 5%.
. . This will earn: dollars in interest in one year.
He invested the rest at 9%.
. . This will earn: dollars in interest in one year.
His total interest is $311: .
and there is our equation!