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Nomor 1
Bruto = netto + Tara
114 = netto + 2
netto = 112 kg => satu karung
netto = 112 × 200 => 200 karung
netto = 22.400 kg
netto = 224 kuintal
Nomor 2
Bunga 1 tahun = 10%
Bunga 12 bulan = 10%
bunga 12 × 2 bulan = 10% × 2
bunga 24 bulan = 20%
T.akhir = T.awal × (100 + bunga)/100 × n/12
T.akhir = 300.000 × 120/100 × 1/12
T.akhir = Rp. 30.000,00
Nomor 3
Banyak kue = 500
Harga beli/kue = 1.500
Harga beli total = 1.500 × 500 = 750.000
Harga jual 400 kue :
= 2.000/kue × 400 kue
= 800.000
Harga jual sisa (500 -400 = 100) kue :
= 1.750/kue × 100
= 175.000
Harga jual total = 800.000 + 175.000
= 975.000
Untung = harga jual -harga beli
= 975.000 -750.000
= 225.000
%Untung = Untung/harga beli
= 225.000/750.000
= 30/100
= 30%
Nomor 4
Semakin banyak pekerja, semakin dikit hari, maka gunakan perbandingan berbalik nilai :
h2/h1 = p1/p2
h2/18 = 30/27
h2 = 10/9 × 18
h2 = 20 hari
. MAPEL MATEMATIKA .
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