【单选题】【消耗次数：1】
张三每月的可支配收入为1000元，每月消费820元；现在张三每月的收入增加了200元后，他每月消费960元。此时张三的边际消费倾向和平均消费倾向分别为( )
①
0.8 0.9
②
0.7 0.9
③
0.7 0.8
④
0.8 0.8
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