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harga beli= 28 x11200=313.600
% u = j-b/bx100%
15% = j-313.600/313.600
15/100=j-313.600/313.600
100(j-313.600)=313.600x15
100j-31360000= 4.704.000
100j= 4.704.000+31.360.000
100j=36064000
j=36.064.000/100
j=360.640
11200×32=358400
15/100×358400=238,933
=Rp.238,933