An electronics store manager stocks from 30 to 40 IBM-compatible computers and from 40 to 50 Macintosh computers. There is room in the store to stock up to 80 computers. The manager receives a commission of $40 on the sale of each IBM-compatible computer and $30 on the sale of each Macintosh computer. If the manager can sell all of the computers, find the maximum commission. 
Inventory           IBM            MacintoshMinimum              30                40Maximum             40                50Commission        $40               $30   

A. $2,900
B. $2,500
C. $3,200
D. $2,800
E. $2,600


Answer: D

Mathematics

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