A corporation has three factories, each of which manufactures acoustic guitars and electric guitars. The number of units of guitars produced at factory j in one day is represented by aij in the matrix
?
.
?
Find the production levels if production is increased by 20%.
?
A. 
B. 
C. 
D. 
E. 
Answer: E
Mathematics
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B. [-7, ?)
C. [-17, ?)
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Mathematics