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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 2400 ?

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 2400 ? Correct Answer 21

60% of A = 34 of B ⇒60100×A = 34×B ⇒35×A = 34×B ⇒AB = 1512 ⇒AB = 54 ∴ A: B = 5 : 4

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