英文数学题@_@ 高手快进。（急）

来源：百度知道 编辑：UC知道 时间：2024/06/22 02:44:26
A group of students bid $3000 for a stall at the lunar new year fair. They bought 1000 dolls from a wholesaler for $12000 and planned to sell them for $20 each at the stall.

(a) What was their start-up cost?
(b)If all the dolls were sold, find the percentage profit.
(c) It is known that 120 dolls remained unsold at 2 a.m. on the last day.What was the percentage profit or loss at that time?
If these 120 dolls were finally sold for $10 each. Find the overall percentage profit or loss.

(a):12000+3000=15000
(b):(20*1000-15000)/15000=33.3%
(c):[20*(1000-120)-15000]/15000=17.3%

[20*(1000-120)+10*120-15000]/15000=25.3%

（1）15000，（2）0.3333333（3）？，0.2533

Their start-up cost是$3000+$12000=$15000
the percentage profit是1000*8/15000=53.33%
（c）percentage profit是880*8/15000=46.93%
overall percentage profit是880*8-240/15000=45.33%

成本15000，起价15000/1000=15
相当于成本15卖20，获利是营业额的25%
卖了880个，得到17600，2600/17600
又卖了1200，共18800，3800/18800

A - Start up cost = Bid 3000 + 12000 for Dolls total $15000.
B, - Total Sales = 1000 * $20 = 20,000, Profit = $5000. Profit % = 5000/20000 = 25%.
C, - If we take (A) total cost as $15,000, then each doll's cost should be $15, then,

C1 - the profit at 2 a.m. on the last day are as follow:
Total Sales = $20 * 880 dolls = 17600, total cost is $15000, profit / profit %
at 2 am are $2600 / 14.8%

C2 - if they sold the re