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标题: GWD 1-35 [打印本页]

作者: knight9514 时间: 2006-4-1 07:14 标题: GWD 1-35

Q35:

Guy’s net income equals his gross income minus his deductions. By what percent did Guy’s net income change on January 1, 1989, when both his gross income and his deductions increased?

(1) Guy’s gross income increased by 4 percent on January 1, 1989.

(2) Guy’s deductions increased by 15 percent on January 1, 1989.

为何答案是E? 两者相加不是能算出来吗?

作者: applebees 时间: 2006-4-2 07:56

if gross income = x, and deductions = y, then before 01/01/89 the net income is x - y; after 01/01/89, the net income is 1.04x - 1.15y, and we want to know by how many did the net income grew, since the answer depends on the values of x and y(plug in some numbers the results will be different), thus 1) and 2) are not sufficient to solve the problem;

作者: falcons 时间: 2006-4-3 07:15

如果求net income的变化率是（1.04x-1.15y）/(x-y)吗？

有那位热心的xdjm在解释的清楚一点吗？：）谢谢！

作者: oldersea 时间: 2006-4-3 13:37

net income change rate=(（1.04x-1.15y)-(x-y)) / (x-y)

注意：变化是在原来的基础上的，所以除(x-y)！：）

请指正.谢谢

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