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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ८

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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प्रश्न

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

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उत्तर

₹ 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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अध्याय 4: Life Mathematics - Exercise 4.2 [पृष्ठ १३०]

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सामाचीर कलवी Mathematics [English] Class 8 TN Board
अध्याय 4 Life Mathematics
Exercise 4.2 | Q 1. (ii) | पृष्ठ १३०

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