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Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 8

A mobile phone is sold for ₹ 8400 at a gain of 20%. The cost price of the mobile phone is ________ - Mathematics

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Question

A mobile phone is sold for ₹ 8400 at a gain of 20%. The cost price of the mobile phone is ________

Fill in the Blanks
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Solution

₹ 7000

Explanation;

Hint:

Let cost price of mobile be ₹ x

Given that selling price is ₹ 8400 and gain is 20%

As per formula,

S.P = `((100 + "gain"%))/100 xx "C.P"`

∴ by substituting we get,

8400 = `((100 + 20))/100 xx x`

8400 = `120/100 x`

x = `(8400 xx 100)/120`

= ₹ 7000

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Chapter 4: Life Mathematics - Exercise 4.2 [Page 130]

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Samacheer Kalvi Mathematics [English] Class 8 TN Board
Chapter 4 Life Mathematics
Exercise 4.2 | Q 1. (ii) | Page 130

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