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

By selling a speaker for ₹ 768, a man loses 20%. In order to gain 20%, how much should he sell the speaker? - Mathematics

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Question

By selling a speaker for ₹ 768, a man loses 20%. In order to gain 20%, how much should he sell the speaker?

Sum

Solution

Selling price (S.P) of speaker = ₹ 768

Loss % = 20%

as per formula

S.P = `"C.P" xx ((10 - "loss"%))/100`

∴ 768 = `"C.P" xx ((100 - 20)/100)`

∴ C.P = `(768 xx 100)/80` = 960

For gain of 20%, we should now calculate the selling price

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

= `960((100 + 20)/100)`

= `960 xx 120/100`

= 96 × 12

= ₹ 1152

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Chapter 4: Life Mathematics - Exercise 4.2 [Page 131]

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Samacheer Kalvi Mathematics [English] Class 8 TN Board
Chapter 4 Life Mathematics
Exercise 4.2 | Q 6 | Page 131
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