Matrix $Q$ (3 products × 2 branches) holds units sold; row vector $p$ ($1\times 3$) holds unit prices. What does $pQ$ compute?

A. Total revenue per branch, a $1\times 2$ row

$(1\times 3)(3\times 2) = 1\times 2$: for each branch, prices × quantities summed over products, revenue per branch. The dot product is the invoice total.