• May 12th 2006, 01:39 AM
bobby77
Mr. Nielsen invested $250,000 in two different automobile companies. The first earned a 5% profit, and second earned a 10% profit. If Mr. Nielsen made 3 times as much profit from the 10% investment as he did from the 5% investment, how much did he invest in the company that made 5%? • May 12th 2006, 02:20 AM CaptainBlack Quote: Originally Posted by bobby77 Mr. Nielsen invested$250,000 in two different automobile companies. The first earned a 5% profit, and second earned a 10% profit. If Mr. Nielsen made 3 times as much profit from the 10% investment as he did from the 5% investment, how much did he invest in the company that made 5%?

Let $x$ be how much invested in the 5% company, then the
amount invested in the 10% company was $250-x$.

Profit from 10% investment:

$
P_{10}=0.1(250-x)
$

Profit from 5% investment:

$
p_5=0.05\ x
$

We are told that $P_{10}=3\times P_5$ so:

$
0.1 \times (250-x)=3\times (0.05 x)
$

or:

$
25-0.1x=0.15 x
$

Which you should be able to solve.

RonL