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%naik = [(Harga setelah - Harga sebelum)/Harga sebelum] × 100%
Contoh:
Harga baju bulan ini = Rp. 45.000
Harga bulan lalu = Rp. 30.000
⇨%Kenaikan harga
= [(Harga setelah - Harga sebelum)/Harga sebelum] × 100%
= [(Rp. 45.000 - Rp. 30.000)/Rp. 30.000 ] × 100%
= (Rp. 15.000/Rp. 30.000) × 100%
= ½ × 100%
= 50%