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misalkan harga mula-mula = x
802.000 = x + 20/100x
802.000 = x + 1/5x
802.000 = x(1+1/5)
802.000 = 6/5x
802.000 × 5/6 = x
668.333,3 = x
harga beli tiap barang = 668.333,3/3
= 222.777,7