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unique00
@unique00
July 2022
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Цену сначала снизили на 20%, а затем повысили на y%. В резульзати конечная цена стала на 20% больше от первоначальной. найдите у.
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Indentuum
Цена x
x — 0.2x = 0.8x
0.8x + y/100*(0.8x) = 1.2x
y/100*(0.8x) = 0.4x
2y/100 = 1
y = 50
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Answers & Comments
x — 0.2x = 0.8x
0.8x + y/100*(0.8x) = 1.2x
y/100*(0.8x) = 0.4x
2y/100 = 1
y = 50