5. A stationery shopkeeper earns a profit of 2 by selling one notebook and incurs a
loss of * 1 per pencil. If on a particular day he sold 30 notebooks and earned a profit of 3 50, find the
number of pencils he sold that day.
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Answer:
Profit earned by selling 1 pen = Re 1
Profit earned by 45 pens = Rs. 45, which we denote by + Rs. 45
Total loss given = Rs. 5, which we denote by Rs -5.
Profit earned + Loss incurred = Total Loss
Therefore, loss incured = Total Loss - Profit earned.
= Rs. (-5-45)
=Rs. (-50)= -5000 paise
Loss incurred by selling one pencil = 40 paise, which we write as -40 paise.
So, number of pencils sold = (−5000)÷(−40)=125 pencils.
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