Question

If the cost price of 10 notebook is equal to the selling price of 9 notebook . Find the gain or loss percent

Answer 1

$\bold {\huge {\mathfrak {Solutions :}}}$

Given :
Cost Price of 10 notebook is equal to the selling price of 9 notebook.

Find the LCM of 10 and 9, we get :-

LCM of 10 and 9 is 90

Therefore,
Cost Price of 10 notebook = Rs 90
Cost Price of 1 notebook = Rs (90/10) = Rs 9
Selling price of 9 notebook = Rs 90
Selling price of 1 notebook = Rs (90/9) = Rs 10

Selling price is greater than the Cost price. Therefore, Gain .

Gain = S.P - C.P
= Rs (10 - 9)
= Rs 1

Gain Percent = (Gain × 100)/C.P %
= (1 × 100)/9 %
= 100/9 %
= 11.11 % (approx.)

Hence,
Gain Percent = 11.11 %

Answer 2

$\underline{\underline{\Huge\mathfrak{Answer ;}}}$

Dear ,

Your Answer is ; 11.11% Gain

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• Step by Step Explanation ;-
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Given that ;-
• 10 Notebooks CP is equal to the SP of 9 Notebooks.

Now ,
By finding the LCM of 9 and 10 , we get ;- 90

Hence ,
The CP of 10 Notebooks is ₹90.
The CP of 1 Notebook = ₹ 90 ÷ 10 = ₹9

SP of 9 Notebooks = ₹90
SP of 2 Notebook = ₹90 ÷ 9 = ₹10

Here ,
• SP > CP = GAIN !

So , Gain = SP - CP
=> ₹ ( 10 - 9 ) = ₹1

Now ,
Gain % = (Gain × 100 )/CP

So ,
=> ( 1 × 100 ) / 9
=> 11.11% ( Approximate Answer )

Therefore,
Gain % = 11.11%


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