Question

A shopkeeper earns a profit of ₹ 2 by selling one pen and incurs a loss of 25 paise

per pencil while selling pencils of her old stock. In a particular month, she incurs a

loss of ₹ 30. In this period, she sold 35 pens. How many pencils did she sell in this

period?​

Answer 1

Step-by-step explanation:

By selling a pen gain is Rs.2

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