Rp4.500,00
Pembahasan:
10 pak = 10 × 10 = 100 buku
Hj = Hb + untung
= Hb + %keuntungan × Hb
= Hb + 20% × Hb
= 375.000 + 20% × 375.000
= 375.000 + 75.000
= 450.000
Harga jual per satuan
= harga buku seluruhnya
banyak buku
= 450.000
100
= 4.500
Jadi, harga jual buku per satuan sebesar Rp4.500,00.