The cost of manufacturing x water pumps is Tk.9000+400x. The amount received by selling these x water pumps is Tk. 500x. What is the least number of water pumps that must be manufactured and sold so that that the amount recieved is at least equal to the manufacturing cost ?
A. 50
B. 60
C. 90
D. 100
E. None of these
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সঠিক উত্তরঃ
C.
90
Explanation:
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