Bài 3: Một gia đình có đăng ký định mức nước cho 3 người. Tháng vừa rồi dùng hết 15 m 3 nước. Hãy tính số tiền cần trả (bao gồm phí bảo vệ môi trường, thuế GTGT) Bài 4: Một gia đình KHÔNG đăng ký định mức nước. Tháng vừa rồi dùng hết 22 m 3 nước. Hãy tính số tiền cần trả (bao gồm phí bảo vệ môi trường, thuế GTGT). Hỏi gia đình phải trả hết bao nhiêu tiền nước? ( GTGT : GIÁ TRỊ GIA TĂNG ; BVMT : BẢO VỆ MÔI TRƯỜNG ; GTGT = 5% ; BVMT = 10% )

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