Question

please answer in a way I can understand easily

Answer 1

$\underline\bold\pink{\huge{HELLO\:DEAR}}$

$\underline\bold\red{\huge{ANSWER : }}$

Cost price of 20 pens = Selling price of 15 pens (Given).

Let C.P. of 20 pens be Rs. 20x and S. P. of 15 pens be Rs. 15x.

So, from here, we can write,

C. P. Of 15 pens = Rs. 15x
S. P. Of 20 pens = Rs. 20x
Profit = (S. P. - C. P.)
= (20x-15x)
= 5x

Now, profit percentage = (profit/cp)×100
= (5x/15x) ×100 %
= (100/3) %
= $33 \frac{1}{3}$
[OPTION - B]

✨✨✨✨ ALWAYS BE BRAINLY ✨✨✨✨

Answer 2

Let the cost price of 1 pen = 1.

Then, the cost price of 15 pens = 15.

Selling price of 15 pens = 20.

Here, Selling price > Cost price. So, gain ha occured.

We know that Gain = Selling price - Cost price

                                = 20 - 15

                                = 5.

We know that Gain% = [Gain * 100]/CP

                                   = [5 * 100]/15

                                   = 500/15

                                   = 33.33333

                                   = 33 1/3%.

Therefore, Gain percent is 33 1/3% - Option(B).

Hope it helps!