问题 解答题

开元商场销售一批名牌T恤,平均每天可售出20件,每件盈利40元,为了扩大销售,增加盈利,尽快减少库存,商场决定采用适当的降价措施,经调查发现,如果每件T恤每降价为1元,商场平均每天可多售出2件。

(1)若商场平均每天要盈利1200元,则每件T恤应降价多少元?

(2)每件T恤降价多少元时,商场平均每天盈利最多?最大盈利多少元?说说你的理由。

答案

解:(1)设每件衬衫降价x元时,商场每天盈利1200元,

根据题意得(20+2x)(40-x)=1200

解得x=10,或x=20,

∵要尽快减少库存,

∴每件应降价20元;

(2) (20+2x)(40-x)=-2x2-20x+80x+800=-2(x-15)2+1250,

则当x=15时,平均每天盈利最多,最大盈利为1250元,所以降价15元时,平均每天盈利最多,最大盈利为1250元。

阅读理解

“So, Mr. Banks, you’re going on holiday with your family to Bournemouth,” said the police officer. “You left Brandford early this morning and came down the motorway. Then you left the motorway near Tewkesbury and stopped to buy a paper at a little place called Stanway. It was 11 o’clock. Then you stopped about fifteen minutes later here, in Stow, and went into the back of your Somna—Mobile (家庭旅游车), but your wife wasn’t there.”

“That’s right, officer.”

“Perhaps she got off at Stanway,” the policeman said.

“We didn’t hear mum,” Vicki said, “I think …”

“I want my mum,” Eddie said. He began to cry.

“We’ll find her, sonny(宝贝)” the policeman said kindly.

※                ※                  ※             ※

“So, Mrs. Banks,” the man said, “Your husband stopped here, in Stanway, about fifteen minutes ago and you went into the supermarket to get some coffee. Your husband didn’t know you weren’t in the back of the Somna and …”

“Perhaps he knew she wasn’t there,” the woman said.

“Quiet, Matilde. He didn’t know and must have driven away. Then we stopped and our Somna is exactly the same as yours. So you got in and made coffee.”

“I’ve lost my husband and my children,” Fay said.

“Don’t worry, Mrs. Banks,” the man said kindly. “We’ll find them. I suppose they are traveling south”.

67. How many people took park in the conversations?

A. Eight  B. Seven C. Six     D. Five

68. Which of the following statements is true?

A. Matilde lost her husband and children.

B. Mr. Banks dropped his wife halfway to Brandford.

C. Mr. Banks lost his wife halfway to Bournemouth and he went to the police for help.

D. The police officer knew where Mrs. Banks was.

69. Fay was now        .

A. in Matilde and her husband’s Somna          B. at the supermarket

C. in the police station   D. in a bar

70. What mistake did Fay make to cause the trouble?

A. She went to the supermarket during the trip.

B. She got in another Somna without telling her husband.

C. She got in a wrong Somna.

D. She shouldn’t have bought the coffee.

问答题 简答题