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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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