1. Matrix C shows the dollar amounts invested in gold, stocks and bonds for each of three people.
a) The annual rates of return for gold, stocks and bonds were 12%, 6% and 3% respectively.
Find each person's total earned income for the year from these investments.
g
C =
Ron 12

Jane
8

Joe  10
s
b
30
25 

40

25 
15
20
2. An investor invested an unknown amount in gold, stocks and bonds. He put 20% of the total into
gold. The rates of return for the gold, stocks and bonds were 10%, 5%, and 2% respectively. His total
return was $4500. How much did he invest in each fund?
3. One package of dog food made from chicken, rice and soy products costs $5.00 and contains 56 grams
of protein. The costs per ounce of chicken, rice and the soy products are $0.60, $0.20 and $0.30
respectively. The protein contents, in grams per ounce, for chicken, rice and soy are 7, 2, and 4
respectively. How many ounces of each ingredient does the package contain?
4. A company produces 3 products, X, Y and Z. The table shows the costs, in dollars per unit, for
producing, packaging and shipping each product.
Production
X
2
Y
Z
a)
Packaging
Shipping
4
5
0.20
0.40
0.60
0.70
0.75
0.80
What is the total cost of producing, packaging and shipping 4 hundred of X, 3 hundred of Y and
6 hundred of Z?
b) How many of each can they produce, pack and ship if they have available $1820 for production,
$2170 for packaging, and $2660 for shipping?