Solve the problem.Suppose one hour's output (measured in bottles) in a brewery is described by the following matrix: Production line 1 Production line 2
= ALet H = 
where x represents the number of hours Production line 1 is in operation in a day and y represents the number of hours Production line 2 is in operation in a day. Then the entry in the second row, first column of AH, represents
A. the total number of bottles of light beer produced in a day.
B. the total number of hours in a day spent producing regular beer.
C. the total number of bottles of regular beer produced in a day.
D. the total number of hours in a day spent producing light beer.
E. none of these
Answer: A
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