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

Gopi sold a laptop at 12% gain. If it had been sold for ₹ 1200 more, the gain would have been 20%. Find the cost price of the laptop

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Question

Gopi sold a laptop at 12% gain. If it had been sold for ₹ 1200 more, the gain would have been 20%. Find the cost price of the laptop

Sum
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Solution

Let the cost price of the laptop be ‘x'

Gain = 12%

∴ Selling price (S.P) = `"C.P"( 1 + ("gain"%)/100)`

Substituting in formula = `x(1 + 12/100)`

= `x((100 + 12)/100)`

= `112/100 x`

If the selling price was 1200 more

i.e `112/100 x + 1200`, the gain is 20%

i.e new selling price = `x(1 + 2/100)`

= `112/100 x + 1200`

= `x(1 + 20/100)`

= `120/100x`

∴ 1200 = `120/100 x - 112/100 x`

1200 = `8/100 x`

∴ x = `(1200 xx 100)/8`

= 15000

Cost price of the laptop is ₹ 15,000/-

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Chapter 4: Life Mathematics - Exercise 4.5 [Page 152]

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Samacheer Kalvi Mathematics [English] Class 8 TN Board
Chapter 4 Life Mathematics
Exercise 4.5 | Q 10 | Page 152
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