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hrga buku= 6000/buku
1 lusin = 1 2buah
rugi = 10%
maka :
Hrga jual seluruh buku = 12 x 6.000 = 72.000
Hrga jual = 100/100-10 x 72.000
= 100/90 x 72.000
= Rp 80.000