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# M1 entrance exam # Profit and loss exam on sale

Grade 1 entrance exam: Profit, loss, discount, almost every year, every school, practice often.

2025/9/3 Edited to

... Read moreถ้ากำลังหา “โจทย์ปัญหา ป.3 พร้อมเฉลย” ที่ทำแล้วเข้าใจจริง เราแนะนำให้เริ่มจากหัวข้อกำไร–ขาดทุน–ลดราคา เพราะเป็นโจทย์ที่พอเปลี่ยนตัวเลขนิดเดียวก็ดูยากขึ้นทันที แต่หลักคิดเหมือนเดิมค่ะ 1) จำคำสำคัญให้แม่น - “ทุน” = ราคาที่ซื้อมา - “ขาย” = ราคาที่ขายออกไป - “กำไร” = ขาย - ทุน (ถ้าได้มากกว่า) - “ขาดทุน” = ทุน - ขาย (ถ้าได้น้อยกว่า) - “ลดราคา x%” = จ่ายเหลือ (100 - x)% 2) ทริคตัวคูณเปอร์เซ็นต์ (ช่วยคิดเร็ว) เวลาโจทย์บอกเป็นเปอร์เซ็นต์ เราชอบแปลงเป็น “ตัวคูณ” ก่อน - กำไร 25% ของทุน ⇒ ราคาขาย = ทุน × 1.25 - ขาดทุน 10% ของทุน ⇒ ราคาขาย = ทุน × 0.90 - ลดเงินสด 10% ⇒ ราคาที่จ่าย = ราคาเดิม × 0.90 ทำแบบนี้จะไม่สับสนว่าเอา % ไปคูณกับอะไร 3) ตัวอย่างแนวเดียวกับภาพ (พร้อมเฉลย) โจทย์: ซื้อทีวีราคา 3,000 บาท ตั้งราคาขายให้ได้กำไร 25% แล้วถ้าลูกค้าจ่ายเงินสดลดให้ 10% ลูกค้าต้องจ่ายเท่าไร? วิธีทำ: - ตั้งราคาขายก่อนลด = 3,000 × 1.25 = 3,750 บาท - ลดเงินสด 10% ⇒ จ่าย = 3,750 × 0.90 = 3,375 บาท ตอบ: 3,375 บาท 4) แบบฝึกหัดสั้น ๆ (พร้อมเฉลย) สำหรับ ป.3 ข้อ 1: แม่ค้าซื้อดินสอมาแท่งละ 20 บาท ขายกำไร 15% ขายกี่บาท? เฉลย: 20 × 1.15 = 23 บาท ข้อ 2: ซื้อสมุด 50 บาท ลดราคา 20% เหลือเท่าไร? เฉลย: 50 × 0.80 = 40 บาท ข้อ 3: ซื้อของมา 200 บาท ขายได้ 180 บาท ขาดทุนกี่บาท และคิดเป็นกี่เปอร์เซ็นต์ของทุน? เฉลย: ขาดทุน 200-180=20 บาท, เปอร์เซ็นต์ = 20/200=0.10 = 10% 5) เช็กจุดพลาดที่เจอบ่อย - เอาเปอร์เซ็นต์ไปคูณ “ราคาขาย” ทั้งที่โจทย์บอก “ของทุน” - ลดหลายครั้งแล้วเผลอลบทีเดียว (ควรคูณทีละขั้น เช่น ×0.90 แล้วค่อย ×0.95) ถ้าฝึกทำโจทย์แนวนี้บ่อย ๆ จะเริ่มมองออกเองว่าโจทย์ต้อง “ตั้งราคา” ก่อนหรือ “ลดราคา” ก่อน แล้วคำตอบจะออกมาถูกแบบไม่งงค่ะ

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