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Rugi = Harga beli - Harga jual
Persentase laba = Laba / Harga beli x 100%
Persentase rugi = Rugi / Harga beli x 100 %
/ = Per
Jumlah n suku → Sn=n/2*{2a+(n-1)b} atau n/2*{a+Un}