Manufacturing Two departments of a firm, $\mathrm{A}$ and $\mathrm{B}$, need different amounts of the same products. The following table gives the amounts of the products needed by the two departments.

	Steel	Plastic	Wood
Department $\mathrm{A}$	$30$	$20$	$10$
Department $\mathrm{B}$	$20$	$10$	$20$

These three products are supplied by two suppliers, Ace and Kink, with the unit prices given in the following table.

	Ace	**Kink*8
Steel	$300$	$280$
Plastic	$150$	$100$
Wood	$150$	$200$

(a) Use matrix multiplication to find how much these two orders will cost at the two suppliers. The result should be a $2 \times 2$ matrix.

(b) From which supplier should each department make its purchase?

Your department sends its copying to the photocopy center of your company. The center bills your department 0.10 per page. You have investigated the possibility of buying a departmental copier for 3000 dollars. With your own copier, the cost per page would be 0.03 dollars. The expected life of the copier is 4 years. How many copies must you make in the four-year period to justify buying the copier?

Alexandra and Jean-Sébastian work in a department store. Alexandra is speaking sharply to Jean-Sébastien. Give him the same instruction in a more tactful way.

Parle $\`a$ cette dame !

Alexandra and Jean-Sébastian work in a department store. Alexandra is speaking sharply to Jean-Sébastien. Give him the same instruction in a more tactful way.

Change le DVD !

Alexandra and Jean-Sébastian work in a department store. Alexandra is speaking sharply to Jean-Sébastien. Give him the same instruction in a more tactful way.

Téléphone au directeur !

If you buy a 13-week T-bill with a maturity value of $5,000 for$4,922.15 from the U.S. Treasury Department, what annual interest rate will you earn?

A $19.9$-ft walkway between two department stores is higher at one end than the other. The sine of the angle of elevation is $0.1299$. Determine the distance between the two buildings.

“To ensure unbiased cost allocations, fixed costs should be allocated on the basis of estimated long-run use by user-department managers.” Do you agree? Why?

Suppose that a department contains 10 men and 15 women. How many ways are there to form a committee with six members if it must have the same number of men and women?

The state sales tax in New York is 4.25%. Jean spends $208 at a department store, but only half of the merchandise she purchases is taxed. What is her total bill?

Discuss the statement and tell what possible misuses or misinterpretations may exist. Morgan's is the largest department store in New York. So shop at Morgan 's and save money.

The table shows the number of people employed in agriculture in the United States from the year 1940 to the year 2000.

U.S. Agricultural Employment

Draw a scatter plot and a trend line for the data.

Identify the type of responsibility center (revenue center, cost center, profit center, or investment center) for each of the following situations. D. the sales department of Four Winns

An item at a department store is priced at 189.99 dollars and can be bought by making 20 payments of 10.50 dollars. Find the interest rate, assuming that interest is compounded monthly.