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= 3,14*30^2*80
= 3,14*900*80
= 226.080 cm^3
volume 2 bola = 2(4/3*phi*r^3)
= 2(4/3*3,14*12^3)
=2(4/3*3,14*1728)
=2(7234,56)
= 14.469,12 cm^3
volume akhir = vol.awal+vol.2 bola
phi*r^2*t akhir= 226.080+14.469,12
3,14*30^2*t akhir= 240.549,12
2826*t akhir=240549,12
t akhir= 85,12
maka krnaikan tinggi air = t akhir - t awal
= 85,12 - 80
= 5,12 cm
jawabannya yang B