a trader lost 20 by selling a watch for tk 1024, Profit and Loss, General Mathematics

Question:A trader lost 20% by selling  a watch for tk 1024. What percent shall he gain or loss by selling it for tk 1472?

Answer Let the new gain be  x%

Then, 80 : 1024 = (100 + x) : 1472

or, `80/1024` = `(100+x)/1472`

or, 100 + x = `(80 xx 1472)/1024` = 115

So, x = 15%

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A trader lost 20% by selling a watch for tk 1024. What percent shall he gain or loss by selling it for tk 1472?

Question:A trader lost 20% by selling a watch for tk 1024. What percent shall he gain or loss by selling it for tk 1472?

Answer Let the new gain be x% Then, 80 : 1024 = (100 + x) : 1472 or, `80/1024` = `(100+x)/1472` or, 100 + x = `(80 xx 1472)/1024` = 115 So, x = 15%