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yg busuk = 20 % x 1000 = 200 buah
yg terjual = 1000 - 200 = 800 buah
pendapatan = 800 x 350.000 = 280.000.000
rugi = 400.000.000 - 280.000.000 = 120.000.000
prosentase = 120.000.000/400.000.000 x 100% = 30 %