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Koperasi sekolah membeli 12 lusin buku tulis dengan harga Rp37.800,00 per lusin. Jika koperasi menghendaki untung Rp50.400,00, maka harga penjualan tiap buku tulis adalah ....
1 lusin = 12 bukumaka12 = 48.0006 = x6 x 48.000 = 12 x288.000 = 12xx = 288.000/12x = 24.0002. 162 km = 15 liter415 km = x415 x 15 = 162 x 6225 = 162 xx = 6225/162x = 38,425 liter3. 150 = 6 x = 21150 x 21 = 6x 3150 = 6xx = 3150/6x = 525 potong
No.1 =24.000 smoga mmbantu.