BD Merit - Freelancing, BCS, Bank, Primary, Admission, NTRCA

1 . A man buys eggs at the rate of Tk.7.2 per dazon eggs and sells them at Tk.70 per 100 eggs. If his profit is Tk.30, how many eggs did he buy?

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Answer: Option D

Explanation:

Let the number of eggs he bought be D.

Buying price per egg = 7.2/12

Selling price per egg = 70/100

So, 70D/100 - 7.2D/12 = 30

or, 7D/10 - 7.2D/12 = 30

or, (42D - 36D) / 60 = 30

or, 6D = 60 x 30

or, D = 1800 / 6 = 300.