下面是育实商店1999年9月～12月销售额统计图．根据这个统计图回答下面问题．（1）这个图是什么统计图？（2）该商店十二月销售额是多少万元？（3）十一月比十月增长百分之几？（4）这四个月的平均销售额是多少万元？
直接写出得数．========
口算．== 5﹣== 0×1= 1÷===
直接写得数．========
直接写得数+=÷7=×=÷=×8= 9÷= 15×=﹣=÷=×=×=÷=
直接写出得数．+=×=÷6=×8=+= 2﹣= 0+=÷= 1÷=﹣=
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= 1÷
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÷7=
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×8= 9÷
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