A salesman makes a 20 percent commission on the selling price of each set of encyclopedias he sells. if he sells 12 identical sets of encyclopedias and makes $1,800 in commissions, what is the selling price of each set?
A. $300
B. $600
C. $750
D. $900
E. $1080
সঠিক উত্তরঃ
C.
$750
Explanation:
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