shopkeeper earns a profit of ₹ 2 by selling one pen and incurs a
loss of 50p per pencil while selling pencils of her old stock.
a) In particular month she incurs a loss of ₹ 10. In this period she sold
45 pens. How many pencils did she sell in this period.
b) In the next month she earns neither profit nor loss. If she sold 80
pens, how many pencils did she sell?
Please answer it is very urgent please
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Answer:
and by selling a pencils, he loses 50 paise
and an eraser, he loses 15 paise
On one day, he gain =Rs.10
On that day he sold 10 pens and pencils and erasers in the ratio of 7:10
On ten pens, his gain =10×2=Rs.20
loss on pencils and erasers =Rs.20−Rs.10=Rs.10=1000 paise
Ratio in pencil and eraser =7:10
Let number of pencils =7x, then eraser =10x
7x×50+10x×15=1000
⇒350x+150x=1000
⇒500x=1000
⇒x=2
Numbe rof penciles =7×2=14
and number of erasers =10×2=20
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