Jawab:
1. Rp10.000, 33,33...%
2. Rp2.070.000
Penjelasan dengan langkah-langkah:
1.
Harga jual = Rp30.000
Harga beli = Rp10.000 × 12/3 = Rp10.000 × 4 = Rp40.000
(12/3, 12 dari selusin bolpoin, dan 3 karena dijual tiap 3 bolpoin)
Keuntungan = Harga beli - Harga jual = Rp40.000 - Rp30.000 = Rp10.000
Persentase = Keuntungan / Harga jual = Rp10.000 / Rp30.000 = 0,33... = 33,33...%
2.
Persentase = Kerugian / Harga jual
(kalikan kedua ruas dengan Harga jual dan tukar posisi)
Kerugian = Persentase × Harga jual
Kerugian = Harga jual - Harga beli
Persentase × Harga jual = Harga jual - Harga beli
Harga beli = Harga jual - Persentase × harga jual
Harga beli = Harga jual × ( 1 - Persentase)
Harga beli = Rp2.300.000 × (1 - 10%)
Harga beli = Rp2.300.000 × (1 - 0,1)
Harga beli = Rp2.300.000 × (0,9)
Harga beli = Rp2.070.000
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Jawab:
1. Rp10.000, 33,33...%
2. Rp2.070.000
Penjelasan dengan langkah-langkah:
1.
Harga jual = Rp30.000
Harga beli = Rp10.000 × 12/3 = Rp10.000 × 4 = Rp40.000
(12/3, 12 dari selusin bolpoin, dan 3 karena dijual tiap 3 bolpoin)
Keuntungan = Harga beli - Harga jual = Rp40.000 - Rp30.000 = Rp10.000
Persentase = Keuntungan / Harga jual = Rp10.000 / Rp30.000 = 0,33... = 33,33...%
2.
Persentase = Kerugian / Harga jual
(kalikan kedua ruas dengan Harga jual dan tukar posisi)
Kerugian = Persentase × Harga jual
Kerugian = Harga jual - Harga beli
Persentase × Harga jual = Harga jual - Harga beli
Harga beli = Harga jual - Persentase × harga jual
Harga beli = Harga jual × ( 1 - Persentase)
Harga beli = Rp2.300.000 × (1 - 10%)
Harga beli = Rp2.300.000 × (1 - 0,1)
Harga beli = Rp2.300.000 × (0,9)
Harga beli = Rp2.070.000