For each notebook, a shopkeeper gets Rs. 4 as profit and for each pen, he loses 20 paise. He made a profit of Rs. 40 and he sold 100 pens during that period. Using your knowledge of integers find out the number of notebooks sold during that period?

No, you need more information

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Yes, 12

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Yes, 14

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Yes, 15

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Solution

The correct option is A
No, you need more information

Loss on selling
1 pen = 20 paise = - Rs 0.2
So, loss on selling 100 pens = Rs. ((-0.2) X 100) = - Rs. 20
Total gain/loss = Profit earned + Loss incurred
So, Profit earned = Total gain/loss - Loss incurred
= Rs. 40 - (-Rs. 20)
= Rs. 40 + Rs. 20
= Rs. 60
So, notebook sold = Rs. 60 ÷ Rs. 4
= 15 notebooks

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