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05年數學會考MC..請解答

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Peter sold two flats for $999999each. he lost 10%on one and gained 10%o n the other.a fter two transactions,peter gain or loss how much ? A.gain 10101, B.gain 20202, C.lost 10101, D.lost 20202 請詳細解釋及列出步驟..THZ

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Let two flats be a and b respectively he lost 10% on one ∴a(1 - 10%) = $999999 a = $1 111 110 he gained 10% on the other ∴b(1 + 10%) = $999999 b = $909 090 ∴peter gain =賣出價 - 買入價 = 2×$999999 - (a + b) =2×$999999 - ($1 111 110 + $909 090) =-$20 202 ∴he lost 20202 ∴The answer is D 2008-02-21 18:16:08 補充: 一開始Let的a和b是two flats的買入價

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