甲、乙、丙三人的月收入分别6000元、3000元、1000元。如果保持三人月收入比值不变且使平均月收入达到5000元，则丙的月收入增加了：（）
A．600元
B．500元
C．400元
D．300元
参考答案：B
解析：
丙占三人总收入的
，平均月收入调整至5000元后，那么三人总收入为5000×3=15000元，则丙为1500元，增加了1500-1000=500元。
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