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Aritmatika Sosial

No. 8

Bunga = n/12 × % B × Mo = M – Mo

n = lama pinjaman

% B = persen bunga per tahun = 10 %

Mo = pinjaman awal = 600000

M = Mo + B

B = M – Mo

n/12 × 10 % × 600000 = 660000 – 600000

n × 5000 = 60000

n = 60000/5000

n = 12 bulan

Lama pinjaman Bu Yuli = 12 bulan = 1 tahun

No. 9

Harga setelah diskon 10% = 450000

(100 – 10)% × harga awal = 450000

90% × harga awal = 450000

harga awal

= harga sebelum diskon

= 450000 × 100/90

= 500000