18.14 Mathematical methods and models in economics

condition: Given a table of balance of two industries, in which there are gaps: \begin{tabular}{|c|c|c|c|c|} \hline \multirow{2}{*}{ Industry } & \multicolumn{2}{|c|}{ Consumption } & \multirow{2}{*}{\( \begin{array}{c}\text { Final } \\ \text { product }\end{array} \)} & \( \begin{array}{c}\text { Gross } \\ \text { issue }\end{array} \) \\ \cline { 2 - 3 } \( \mathbf{1} \) & \( \mathbf{1} \) & \( \mathbf{2} \) & \( ? \) & 60 \\ \hline \( \mathbf{2} \) & 40 & \( ? \) & \( ? \) & 70 \\ \hline \end{tabular} a) Fill in the blanks in table, if the matrix is known