Question

Help plz! surface area

Answer 1

Answer:

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Ncert solutions

Grade 7

Mathematics

Science

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Chapters in NCERT Solutions - Mathematics, Class 7

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Exercises in Comparing Quantities

Question 6

Q6) Juhi sells a washing machine for Rs. 13500. She loses 20% in the bargain. What was the price at which she bought it?

Solution:

The selling price of washing machine = Rs. 13500

Loss percent = 20%

Let the cost price of the washing machine be Rs. x.

Loss = Loss% of C.P.

\Rightarrow⇒ Loss = 20% of Rs. x=\frac{20}{100}\times x=\frac{x}{5}x=

100

20

×x=

5

x

Therefore, S.P. = C.P. - Loss

\Rightarrow\ 13500=x-\frac{x}{5}\Rightarrow13500=\frac{4x}{5}⇒ 13500=x−

5

x

⇒13500=

5

4x

\Rightarrow\ x=\ \frac{13500\times5}{4}=\ Rs.\ 16,875⇒ x=

4

13500×5

= Rs. 16,875

Hence, the cost price of washing machine is Rs. 16,875.