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100-(20+15+25)
= 100-60
= 40 %
20/40 = 120/x
x (banyak beras yang terjual) = 4 x120/2
4 x 60 = 240 kg
semoga bermanfaat
=100%-6%
=40%
gandum 20% = 120 maka 1%=6
maka beras 40%
40 x 6= 240 kg
yang D