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ARITMATIKA SOSIAL 1
1. JUAL – BELI
a. Untung
Rumus :
Untung = Harga Jual – Harga Beli
Persentase Untung =
𝑈𝑛𝑡𝑢𝑛𝑔
𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖
𝑥 100
Jika diketahui persentase untung (P) :
Harga Jual =
100+ 𝑃
100
𝑥 𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖
Harga Beli =
100
100+𝑃
𝑥 𝐻𝑎𝑟𝑔𝑎 𝐽𝑢𝑎𝑙
b. Rugi
Rumus :
Rugi = Harga Beli – Harga Jual
Persentase Rugi =
𝑅𝑢𝑔𝑖
𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖
𝑥 100
Jika diketahui persentase rugi (P) :
Harga Jual =
100− 𝑃
100
𝑥 𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖
Harga Beli =
100
100−𝑃
𝑥 𝐻𝑎𝑟𝑔𝑎 𝐽𝑢𝑎𝑙
CONTOH JUAL – BELI :
1. Pak Fauzan adalah seorang makelar sepeda motor. Membeli sebuah motor
bekas dengan harga Rp 8.250.000. kemudian ia memperbaiki sepeda tersebut
dan menghabiskan Rp 250.000. setelah itu, sepeda tersebut dijual dan laku
dengan harga Rp 9.520.000. persentase untung yang diperoleh Pak Fauzan
adalah…
PEMBAHASAN :
Untung = harga jual – harga beli
Untung = 9.520.000 – (8.250.000 + 250.000) = 1.020.000
Persentase Untung =
𝑈𝑛𝑡𝑢𝑛𝑔
𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖
𝑥 100
Persentase untung =
1.020.000
8.500.000
𝑥 100 = 12%
2. Anto adalah seorang pedagang durian. Ia membeli durian dari pedagang
seharga Rp 3.200.000. Karena cuaca yang tidak menentu, menyebabkan
beberapa buah duriannya membusuk sehingga ia mengalami kerugian 7%.
Harga jual seluruh duriannya adalah…
PEMBAHASAN :
Harga Jual =
100− 𝑃
100
𝑥 𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖
Harga jual =
100−7
100
𝑥 3.200.000 =
93
100
𝑥 3.200.000 = 2.976.000
2. TABUNGAN DAN PINJAMAN
a. Tabungan
Rumus :
Bunga = Tabungan Akhir – Tabungan Awal
Bunga untuk tahun :
Bunga = Tabungan Awal x
𝑃𝑒𝑟𝑠𝑒𝑛𝑡𝑎𝑠𝑒 𝐵𝑢𝑛𝑔𝑎
100
x n
Bunga untuk bulan :
Bunga = Tabungan Awal x
𝑃𝑒𝑟𝑠𝑒𝑛𝑡𝑎𝑠𝑒 𝐵𝑢𝑛𝑔𝑎
100
x
𝑛
12
Tabungan Akhir = Tabungan Awal + Bunga
Tabungan Akhir jika diketahui persentase bunga :
Tabungan Akhir =
100 +𝑃
100
𝑥 𝑇𝑎𝑏𝑢𝑛𝑔𝑎𝑛 𝐴𝑤𝑎𝑙
Tabungan Awal =
100
100+𝑃
𝑥 𝑇𝑎𝑏𝑢𝑛𝑔𝑎𝑛 𝐴𝑘ℎ𝑖𝑟
Tabungan Awal =
100
𝑃
𝑥 𝐵𝑒𝑠𝑎𝑟 𝐵𝑢𝑛𝑔𝑎
b. Pinjaman
Rumus :
Besar uang yang harus dikembalikan = Pinjaman + Bunga
Jika besar bunga pinjaman adalah P% :
Besar bunga pinjaman =
𝑃
100
𝑥 𝑃𝑖𝑛𝑗𝑎𝑚𝑎𝑛
Pinjaman =
100
100+𝑃
𝑥 𝑡𝑜𝑡𝑎𝑙 𝑦𝑎𝑛𝑔 𝑑𝑖𝑘𝑒𝑚𝑏𝑎𝑙𝑖𝑘𝑎𝑛
Yang harus dikembalikan =
100+𝑃
100
𝑥 𝑃𝑖𝑛𝑗𝑎𝑚𝑎𝑛
Yang harus dikembalikan =
100+𝑃
100
𝑥 𝐵𝑢𝑛𝑔𝑎 𝑃𝑖𝑛𝑗𝑎𝑚𝑎𝑛
CONTOH TABUNGAN DAN PINJAMAN :
1. Andi menabung di bank sebesar Rp 2.000.000. ia mendapat bunga 8% per
tahun. Uang tabungan andi setelah 9 bulan adalah…
PEMBAHASAN :
Bunga = Tabungan Awal x
𝑃𝑒𝑟𝑠𝑒𝑛𝑡𝑎𝑠𝑒 𝐵𝑢𝑛𝑔𝑎
100
x
𝑛
12
Bunga = 2.000.000 x
8
100
𝑥
9
12
= 120.000
Tabungan Akhir = Tabungan Awal + Bunga
Tabungan akhir = 2.000.000 + 120.000 = 2.120.000
2. Seseorang meminjam uang di koperasi sebesar Rp 8.000.000 yang akan
diangsur selama 10 bulan dengan bunga 12% per tahun. Besar angsuran tiap
bulan adalah…
PEMBAHASAN :
Bunga = Tabungan Awal x
𝑃𝑒𝑟𝑠𝑒𝑛𝑡𝑎𝑠𝑒 𝐵𝑢𝑛𝑔𝑎
100
x
𝑛
12
Bunga = 8.000.000 x
12
100
𝑥
10
12
= 800.000
Besar Angsuran =
𝑃𝑖𝑛𝑗𝑎𝑚𝑎𝑛 +𝐵𝑢𝑛𝑔𝑎
𝐿𝑎𝑚𝑎 𝐴𝑛𝑔𝑠𝑢𝑟𝑎𝑛
Besar angsuran =
8.000.000 + 800.000
10
= 880.000

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7 aritmatika sosial

  • 1. ARITMATIKA SOSIAL 1 1. JUAL – BELI a. Untung Rumus : Untung = Harga Jual – Harga Beli Persentase Untung = 𝑈𝑛𝑡𝑢𝑛𝑔 𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖 𝑥 100 Jika diketahui persentase untung (P) : Harga Jual = 100+ 𝑃 100 𝑥 𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖 Harga Beli = 100 100+𝑃 𝑥 𝐻𝑎𝑟𝑔𝑎 𝐽𝑢𝑎𝑙 b. Rugi Rumus : Rugi = Harga Beli – Harga Jual Persentase Rugi = 𝑅𝑢𝑔𝑖 𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖 𝑥 100 Jika diketahui persentase rugi (P) : Harga Jual = 100− 𝑃 100 𝑥 𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖 Harga Beli = 100 100−𝑃 𝑥 𝐻𝑎𝑟𝑔𝑎 𝐽𝑢𝑎𝑙 CONTOH JUAL – BELI : 1. Pak Fauzan adalah seorang makelar sepeda motor. Membeli sebuah motor bekas dengan harga Rp 8.250.000. kemudian ia memperbaiki sepeda tersebut dan menghabiskan Rp 250.000. setelah itu, sepeda tersebut dijual dan laku dengan harga Rp 9.520.000. persentase untung yang diperoleh Pak Fauzan adalah… PEMBAHASAN : Untung = harga jual – harga beli Untung = 9.520.000 – (8.250.000 + 250.000) = 1.020.000 Persentase Untung = 𝑈𝑛𝑡𝑢𝑛𝑔 𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖 𝑥 100 Persentase untung = 1.020.000 8.500.000 𝑥 100 = 12%
  • 2. 2. Anto adalah seorang pedagang durian. Ia membeli durian dari pedagang seharga Rp 3.200.000. Karena cuaca yang tidak menentu, menyebabkan beberapa buah duriannya membusuk sehingga ia mengalami kerugian 7%. Harga jual seluruh duriannya adalah… PEMBAHASAN : Harga Jual = 100− 𝑃 100 𝑥 𝐻𝑎𝑟𝑔𝑎 𝐵𝑒𝑙𝑖 Harga jual = 100−7 100 𝑥 3.200.000 = 93 100 𝑥 3.200.000 = 2.976.000 2. TABUNGAN DAN PINJAMAN a. Tabungan Rumus : Bunga = Tabungan Akhir – Tabungan Awal Bunga untuk tahun : Bunga = Tabungan Awal x 𝑃𝑒𝑟𝑠𝑒𝑛𝑡𝑎𝑠𝑒 𝐵𝑢𝑛𝑔𝑎 100 x n Bunga untuk bulan : Bunga = Tabungan Awal x 𝑃𝑒𝑟𝑠𝑒𝑛𝑡𝑎𝑠𝑒 𝐵𝑢𝑛𝑔𝑎 100 x 𝑛 12 Tabungan Akhir = Tabungan Awal + Bunga Tabungan Akhir jika diketahui persentase bunga : Tabungan Akhir = 100 +𝑃 100 𝑥 𝑇𝑎𝑏𝑢𝑛𝑔𝑎𝑛 𝐴𝑤𝑎𝑙 Tabungan Awal = 100 100+𝑃 𝑥 𝑇𝑎𝑏𝑢𝑛𝑔𝑎𝑛 𝐴𝑘ℎ𝑖𝑟 Tabungan Awal = 100 𝑃 𝑥 𝐵𝑒𝑠𝑎𝑟 𝐵𝑢𝑛𝑔𝑎 b. Pinjaman Rumus : Besar uang yang harus dikembalikan = Pinjaman + Bunga Jika besar bunga pinjaman adalah P% : Besar bunga pinjaman = 𝑃 100 𝑥 𝑃𝑖𝑛𝑗𝑎𝑚𝑎𝑛 Pinjaman = 100 100+𝑃 𝑥 𝑡𝑜𝑡𝑎𝑙 𝑦𝑎𝑛𝑔 𝑑𝑖𝑘𝑒𝑚𝑏𝑎𝑙𝑖𝑘𝑎𝑛 Yang harus dikembalikan = 100+𝑃 100 𝑥 𝑃𝑖𝑛𝑗𝑎𝑚𝑎𝑛 Yang harus dikembalikan = 100+𝑃 100 𝑥 𝐵𝑢𝑛𝑔𝑎 𝑃𝑖𝑛𝑗𝑎𝑚𝑎𝑛
  • 3. CONTOH TABUNGAN DAN PINJAMAN : 1. Andi menabung di bank sebesar Rp 2.000.000. ia mendapat bunga 8% per tahun. Uang tabungan andi setelah 9 bulan adalah… PEMBAHASAN : Bunga = Tabungan Awal x 𝑃𝑒𝑟𝑠𝑒𝑛𝑡𝑎𝑠𝑒 𝐵𝑢𝑛𝑔𝑎 100 x 𝑛 12 Bunga = 2.000.000 x 8 100 𝑥 9 12 = 120.000 Tabungan Akhir = Tabungan Awal + Bunga Tabungan akhir = 2.000.000 + 120.000 = 2.120.000 2. Seseorang meminjam uang di koperasi sebesar Rp 8.000.000 yang akan diangsur selama 10 bulan dengan bunga 12% per tahun. Besar angsuran tiap bulan adalah… PEMBAHASAN : Bunga = Tabungan Awal x 𝑃𝑒𝑟𝑠𝑒𝑛𝑡𝑎𝑠𝑒 𝐵𝑢𝑛𝑔𝑎 100 x 𝑛 12 Bunga = 8.000.000 x 12 100 𝑥 10 12 = 800.000 Besar Angsuran = 𝑃𝑖𝑛𝑗𝑎𝑚𝑎𝑛 +𝐵𝑢𝑛𝑔𝑎 𝐿𝑎𝑚𝑎 𝐴𝑛𝑔𝑠𝑢𝑟𝑎𝑛 Besar angsuran = 8.000.000 + 800.000 10 = 880.000