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= 110,88 mm3
v setengah bola = 1/2 . 4/3 . 22/7 . 4,2^3
= 155,232 mm3
110,88 + 155,232 = 266,112mm3 = 0,266 cm3
0,266 x 7,5 = 2,25 gr
2,25 x 350.000 = Rp 787.500
787500 + 50000= Rp 837.500