A garden center sells a certain grass seed in 5-pound bags at $13.85 per bag, 10-pound bags at $20.43 per bag, and 25-pound bags at $32.25 per bag. If a customer is to buy at least 65 pounds of the grass seed, but no more than 80 pounds, what is the least possible cost of the grass seed that the customer will buy?



$94.03

$96.75

$98.78

$102.07

$105.36

考题讲解

题目分析:

首先把三种规格的种子计算下平均每磅的价格:


itemsCost per pound;平均每磅价格
5-Pound13.85/5=2.77
10-Pound20.43/10=2.043
25-pound 32.25/25=1.29


可以看出,容量越大,越便宜,所以如果想花最少的钱,应该尽可能买大包装的 25 磅的。顾客买 65 到 80 磅的种子,根据题目因为种子的规格只有 5,10,25,都是 5 的倍数,所以顾客买的总重量应该是 5 的倍数,只能是 65,70,75,80. 求得是总花费最少,应该尽可能买 25 磅的,然后是 10 磅最后选择 5 磅

从表中可以看出,最小的花费应该是 96.75.

综上:答案是 B。

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