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求解一道数学题 [复制链接]

发表于 2015-2-1 18:58 |显示全部楼层
此文章由 gcyw123 原创或转贴,不代表本站立场和观点,版权归 oursteps.com.au 和作者 gcyw123 所有!转贴必须注明作者、出处和本声明,并保持内容完整
Working mothers who earn $30,000 or less per year receive a rebate on before and after school care of 75%,plus a school bonus of $6,000 that only applies to this categoric of earnings. Each dollar earned above this amount and up to $40,000 reduces the rebate to 55%, and for any amount above this, the rebate drops to 30%. There are three mothers - Jade earns $40,001, Emily earns $38,000 and Lucy earns $29,550. If the cost of before and after school care is $10,000 per year, what amount of money does the person have who has the least amount of money left after paying for before and after school care?

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发表于 2015-2-1 19:17 |显示全部楼层
此文章由 gcyw123 原创或转贴,不代表本站立场和观点,版权归 oursteps.com.au 和作者 gcyw123 所有!转贴必须注明作者、出处和本声明,并保持内容完整
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发表于 2015-2-1 23:17 |显示全部楼层
此文章由 limit-2010 原创或转贴,不代表本站立场和观点,版权归 oursteps.com.au 和作者 limit-2010 所有!转贴必须注明作者、出处和本声明,并保持内容完整
Evaluating the amount of money left for each person:

Jade:  40001 - 10000 + 10000 x 0.30 = 33001

Emily: 38000 - 10000 + 10000 x 0.55 = 33500

Lucy:  29550 - 10000 + 10000 x 0.75 + 6000 = 33050

Hence we find that Jade (who has the highest income of $40,001) ends up with the least
amount of money, which is $33,001.


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