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#### bergausstein

##### Active member

- Jul 30, 2013

- 191

How much additional money should be invested at

8.5% to obtain a return of 8% on the total amount

invested?

my solution,

let

$n=$amount invested @ 8.5%

$0.06(8000)+0.085n=0.08(8000+n)$

$480+0.085n=640+0.08n$

$0.085n-0.08n=640-480$

$n=32,000$

\$32,000 is the addtional money should be invested at 8.5%. is this correct?

2. A businessman invested a total of \$12,000 in two ven-tures. In one he made a profit of 8% and in the other he

lost 4%. If his net profit for the year was $120, how

much did he invest in each venture?

in this problem i don't know how will i represent the amount invested in the other venture. please help. thanks!