18.18 Mathematical Methods and Models in Economics

Condition: Two different in quality of the type of vegetable oil are sold in three stores. Matrix \ (a \)-sales volumes in stores in the 1st quarter, matrix \ (b- \) in the 2nd quarter. Determine: a) sales for two quarters; b) Sales increase in the 2nd quarter compared to the first. \ [A = \ Left (\ Begin {Array} {ll} 3 & 4 \\ 6 & 4 \\ 2 & 3 \ End {Array} \ Right); B = \ Left (\ Begin {Array} {ll} 1 & 2 \\ 5 & 3 \\ 3 & 3 \ End {Array} \ Right) \]