Question

A shopkeeper bought pens at the rate of 7 for Rs 10 and sold them at a profit of 40%. How many pens would a customer get for Rs 10?

Answer 1

let total number of pen to sold is 70.
total buing cost =100
40 % profit
selling price=140
₹140 for 70 pen
then ₹10 for 10×70/140=5
answer=5 pen

Answer 2

Answer:

The number of pens customer would get for Rs 10 is 5

Step-by-step explanation:

Given as :

The cost price of 7 pens = Rs 10

∴ The cost price of 1 pen = Rs $\dfrac{10}{7}$

Now, Profit percentage for selling the pen = 40%

∵ profit % = $\dfrac{sp-cp}{cp}$

or, 40% = $\frac{sp}{cp}$ - 1

or, $\frac{40}{100}$ + 1 =  $\frac{sp}{cp}$

or, $\frac{100+40}{100}$ =  $\frac{sp}{cp}$

or, $\frac{140}{100}$ =  $\frac{sp}{cp}$

or, sp = $\frac{140\times cp}{100}$

or, sp = $\frac{140}{100}$ × $\frac{10}{7}$

∴ sp = Rs 2

So, Selling price of each pen is Rs 2

Now, number of pens = $\frac{Total money}{each pen selling price}$

i.e number of pens = $\frac{10}{2}$ = 5

Hence The number of pens customer would get for Rs 10 is 5 . Answer