英语翻译suppose that bridget and erin spend their incomes on two

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英语翻译
suppose that bridget and erin spend their incomes on two goods ,food(F) and clothing(C),bridget's preferences are represented by the utility function U(F,C)=10FC,while erin's preferences are represented by the utility function U(F,C)=20FC
A:with food on the horizontal axis and cloothing on the vertical axis ,identify on a grph the set of points that give bridget the same level of utility as the bundle(10,5),DO the same for erin on aseparate graph.
主要翻译的A问题,后面的证明要求,特别是bundle（10,5）这个完全看不懂.

假设bridget和erin的收入主要消费食品F和服饰C,bridget的选择可以由效用函数U(F,C)=10FC来表示,erin的选择可以有效用函数U(F,C)=20FC来表示.
A：以食品F为横轴,服饰C为纵轴,确定一个有点集组成的图,这些点和消费组合（10,5）为bridget提供相同的效用.在独立地为erin做同样的图.
说白了就是画无差异曲线,效用水平由消费组合（10,5）确定
再问：那identify the set of bundles that give bridge and erin the same level of utility as the bundle (15,8)呢？
再答： identify the set of bundles that give bridge and erin the same level of utility as the bundle (15,8) 确定消费束（消费组合）的集合，那些消费束能给bridge和erin带来与消费束（15，8）带来的相同的效用

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