GRE
The total interest earned on the investment by Investor $$X$$ at a rate of $$10$$ percent the first year and $$6$$ percent the second year
The total interest earned on the investment by Investor $$Y$$ at a rate of $$6$$ percent the first year and $$10$$ percent the second year
$$xy$$
$$300$$
$$xz$$
$$0$$
25000 +道题目
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