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【OG20-P289-407题】
Each week a certain salesman is paid a fixed amount equal to $300, plus a commission equal to 5 percent of the amount of his sales that week over $1,000. What is the total amount the salesman was paid last week?
(1) The total amount the salesman was paid last week is equal to 10 percent of the amount of his sales last week.
(2) The salesman's sales last week totaled $5,000.
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P=300+0.05(S-1000)
(1)P=0.1S 代入上面式子有解 可求出P
(2)S=5000 也可以求出P
所以 选择D
题目讨论 (2条评论)

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贾思敏
分析题干: The total money he paid = a fixed amount + a commission a fixed amount:300刀 即P=300+C commission = 5% *(total sales - 1000)即P=300+5%(S-1000) 问The total money he paid(P)是多少?很明显嘛,就是要知道它的commission是多少,也就是要知道它的total sales超过1000刀的部分是多少。 条件一:P=10%S 即 P=0.1S,把P=0.1S代入P=300+5%(S-1000),就是变成一个一元一次方程求解了,S不就是可以求出来,P不就是迎刃而解了吗? 条件二:S=5000,把S=5000代入P=300+5%(S-1000),P不也迎刃而解了吗? 最重要的是要将题干的文字语言化成数学等式P=300+5%(S-1000)!不需要求出值,只需要化成一个一元一次方程就可(一元一次方程等式就是可以求出一个唯一解,因为只有一个未知数,而且是等式)
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0 回复 2021-09-28 18:41:33
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全智贤
?那如果S没大于1000的话直接P就是300了啊,所以答案不唯一啊,条件一凭什么单独也充分
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0 回复 2020-11-18 13:36:26
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超级大可爱回复全智贤
如果300是她销售额的10%,那销售额就是3000,超过了1000,形成矛盾。所以销售额肯定超过了1000
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0 回复 2020-12-23 15:14:56
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