题目:
某商场四月份售出某品牌衬衣b件,每件c元,营业额a元.五月份采取促销活动,售出该品牌衬衣3b件,每件打八折,则五月份该品牌衬衣的营业额比四月份增加( )
A.1.4a元
B.2.4a元
C.3.4a元
D.4.4a元
答案:
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