1. Matrix multiplication

2. DMCI Sport Company supplies balls, bats and gloves to sporting
goods stores. The following table indicates the number of items of
each ordered by four different stores.
Balls Bats Gloves
Store P 70 30 22
Store Q 60 20 19
Store R 70 15 24
Store S 50 40 12
Balls cost $8.00 each, bats $30.00 each, gloves $75.00 each

3. a) Write the total order as matrix A.

4. b) Write the cost per item as a column matrix B.

5. c) Using matrix multiplication, create matrix C depicting the total
cost per store.

6. d) Create matrix D which includes a 2% shipping charge per item.

7. e) What is the amount owed to DMCI by each store?

8. f) Find the total amount owing to DMCI.
$11 143.50
multiply matrix D by a row matrix (1 1 1 1) which effectively
gives the sum.

9. Page 64
Questions 3 ­ 7