Total expenditure with the matrix product

Two customers buy three goods. The first buys $2$ units of the first good, $1$ of the second and $3$ of the third; the second buys $0$, $4$ and $1$ units. The unit prices are $5$ euros, $3$ euros and $2$ euros. Write the matrix $Q$ of the quantities (one row per customer) and the column vector $p$ of the prices, and compute with the product $Qp$ the expenditure of each customer.