EM-2139

Matrix multiplication

E Math · Secondary 4 · Hard · Matrix multiplication

The prices of a notebook, a pen and a ruler in Shop X and Shop Y are shown in the matrix

P = \begin{pmatrix} 3.20 & 2.80 \\1.50 & 1.20 \\0.90 & 1.10 \end{pmatrix}

where the first column is Shop X and the second column is Shop Y. A student buys 2 notebooks, 3 pens and 4 rulers. Represent this in a matrix

Q

and find the matrix

T = QP

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