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= 81000
Netto = 20 kg - 2 kg = 18 kg
agar mendapat keuntungan 20%
120/100 . 81000 = 97200
per kg = 97200/18
= 5400
=(90.000x(1-10%)x(1+20%)/20-2
=(90.000x90%x120%/18
=(81.000x120%)/18
=97.200/18
=5.400/kg.