John wants to buy some gifts for his brother
and sister with his pocket money. He wants to buy 1 T-shirt, 3 CDs, 5 books for
his brother and 2 T-shirts, 4 CDs, 3 books for his sister. Each T-shirt costs
$50, each CD costs $10, and each book costs $5. Use a matrix to find the total
cost of gifts for both Johns brother and sister.
Johns brother $
Johns sister $