求解数学一题

沉睡的巨人 · 发表于 2011-1-9 22:40:09

A jewelry dealer initially offered a bracelet for sale at an asking price that would give a profit to the dealer of 40 percent of the original cost. What was the original cost of the bracelet?
(1) After reducing this asking price by 10 percent, the jewelry dealer sold the bracelet at a profit of$403.
(2) The jewelry dealer sold the bracelet for $1953

答案选A，我选D
(1)能推出cost没有问题。对于(2), 我的思路是let cost be X then the equation would be X+40%X=1953 X=1395
What's wrong with (2)?

求解，非常感谢！

sdcar2010 · 发表于 2011-1-9 22:43:20

You do not know if the final selling price is the initially offered price.

沉睡的巨人 · 发表于 2011-1-9 22:45:28

You do not know if the final selling price is the initially offered price.

-- by 会员 sdcar2010 (2011/1/9 22:43:20)

You mean a bargain might appear?

sdcar2010 · 发表于 2011-1-9 22:50:43

Yeah. The seller might raise the final selling price as well. The stimulus gives no indication of the change from the plan. So we do not know for sure how different is the plan from the final execution.

沉睡的巨人 · 发表于 2011-1-9 22:53:56

Yeah. The seller might raise the final selling price as well. The stimulus gives no indication of the change from the plan. So we do not know for sure how different is the plan from the final execution.

-- by 会员 sdcar2010 (2011/1/9 22:50:43)

THX for ur explanation!!

求解数学一题

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