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Solutions
From quantity I,
SI=3500+3500*12*(8/100) =Rs.6860
SI=4200+4200*18*(5/100) =Rs.7980
Total amount=6860+7980=Rs 14840
From quantity II,
x *12*1/100+ (28000-x)*15*1/100=3900
12x+28000*15-15x=390000
3x=30000
x=Rs 10000