EM-2140

Matrix multiplication

E Math · Secondary 4 · Medium · Matrix multiplication

A shop sells notebooks and pens. In Shop X, a notebook costs \$3.20 and a pen costs \.50. In Shop Y, a notebook costs \$2.80 and a pen costs \.90.

A student buys 4 notebooks and 5 pens. Represent this information as a

1\times 2

matrix and multiply by the

2\times 2

price matrix to find the total amount he pays in each shop.

Answer:

$(20.3\ 20.7)$
$(20.7\ 20.3)$
$(19.3\ 21.7)$
$(32.0\ 28.0)$

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