The cost, in taka, of manufacturing x microwaves is 6000+300x taka. The amount received when selling these x microwaves is 700x taka. What is the least number of microwaves that must be manufactured and sold so that the net profit is tk.2,400?
Solution
Correct Answer: Option D
700x-600-300x=2400
or, 400x-6000=2400
or, 400x=8400
or, x=8400/400
or, x= 21
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