Jawabanmu

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2014-06-08T21:50:20+07:00
Fa = massa jenis larutan x perc. gravitasi x volume benda
    = 800 x 10 x V. benda

massa jenis = massa benda / volume benda
4000 = 2 / V. benda
V. benda = 1/2000

Fa = 800 x 10 x 1/2000
     = 4 N 
2 5 2