Help plz! surface area
Answers
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.