Question

一件夹克和一件衬衫原价分别为八十美元和四十美元。促销期间，Chris 以 $40\%$ 折扣买了八十美元的夹克，又以 $55\%$ 折扣买了四十美元的衬衫。节省的总金额是原总价的百分之几？

A jacket and a shirt originally sold for $80 and $40, respectively. During a sale Chris bought the $80 jacket at a $40\%$ discount and the $40 shirt at a $55\%$ discount. The total amount saved was what percent of the total of the original prices?

$45\%$

$47\tfrac12\%$

$50\%$

$79\tfrac16\%$

$95\%$

答案：A

知识点：百分数

难度评级：930

解答：

夹克折扣节省 $40\%$ 的 $\$80 = \$32$ ，衬衫折扣节省 $55\%$ 的 $\$40 = \$22$ 。总共节省 $\$32 + \$22 = \$54$ 。

原总价是 $\$80 + \$40 = \$120$ ，所以节省比例是 $\dfrac{54}{120} = 0.45 = 45\%$ 。

所以正确答案是 A。

The jacket discount saves $40\%$ of $\$80 = \$32,$ and the shirt discount saves $55\%$ of $\$40 = \$22.$ The total saved is $\$32 + \$22 = \$54.$

The original total is $\$80 + \$40 = \$120,$ so the percent saved is $\dfrac{54}{120} = 0.45 = 45\%.$

Thus, the correct answer is A .

1995 AMC 8 第 10 题

答案：A

难度评级：930

解答：

其他年份的第 10 题