Answer
Factory B
Work Step by Step
First create a matrix for the first shift with the top row being factory A and the bottom row being Factory B and with the left column being number of chairs made and the right column being number of tables and fill in the corresponding numbers.
250 145
300 75
Then create a matrix for the second shift with the top row being factory A and the bottom row being Factory B and with the left column being number of chairs made and the right column being number of tables and fill in the corresponding numbers.
275 90
240 120
Then add the 2 matrices together.
250 145 + 275 90 = 525 235
300 75 + 240 120 = 540 195
Compare the top left value in the matrix (number of chairs factory A made over 2 shifts) to the bottom left value in the matrix (number of chairs factory B made over 2 shifts)
525 < 540