A shopkeeper earns a profit of re 1 by selling one pen and incurs a loss of 40 paisa per pencil while selling pencils of her old stock.

(i) In a particular month she incurs a loss of Rs 5. In this period, she sold 45 pens. How many pencils did she sells in this period?

(ii) In the next month she earns neither profit nor loss. I she sold 70 pens, how many pencils did she sell?

THIS QUESTION IS IN NCERT BOOK IN PAGE 25 WITH SOLUTION BUT I CAN'T UNDERSTAND IT.....PLEASE MERITINATION EXPERT MAKE ME UNDERSTAND IT VERY PROPERLY SO THAT I HAVE NO CONFUSION

(i) Overall Profit Or Loss = -5

45 Pens means Profit Of Rs 45

Now No Of Pencils Sold

Price Of Pencils => 45-(-5) = Rs50

So She Sold Pencils At a loss of rs 50

No OF pencils = 50/0.40 = 125

So She Sold 125 pencils.

(ii) Profit Or Loss Incurred = 0

Now 70 pens means profit of Rs 70

Now Cost Price Of Pencils = 70-0 = 70

No of pencils = 70/0.40 = 175

So She Sold 175 pencils.

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Hope You Got It.

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