It costs Tk. 1000 to make the first thousand copies of a book and x taka to make each additional copies. If a total of 6000 copies were made with a total cost of Tk. 5500, what is X?
A. 1
B. .9
C. .8
D. .75
সঠিক উত্তরঃ
B.
.9
Explanation:
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