Matrices & Systems · Medium problem

A company's cost matrix for January is $A = \begin{pmatrix}120&80\\60&150\end{pmatrix}$ (rows: factory $1$, factory $2$; columns: materials, labor, in $$1000$s) and for February is $B = \begin{pmatrix}100&90\\65&130\end{pmatrix}$. The company projects March costs as $2B-A$ (double February's pattern, then correct for January's baseline). Find the row $2$, column $1$ entry of $2B-A$.