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MGSM / アリーナが毎月…

Problem

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question

アリーナが毎月$140かかるストリーミングサービスをサブスクライブしている。最初の半年分を彼女が支払い、その後の半年をストリーミングサービスが10%割引料金で彼女に提供した場合、彼女がその年の終わりまでに、そのストリーミングサービスに支払った料金を計算しなさい。

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