Please answer 8

Initial diameter of base=100mm=10 cmFinal diameter of base 10+21100×10=12.1 cmLet the radius of top be r and height be hInitial volume=V1=13π52h+πr2hFinal volume =V2=13π12.122h+πr2h=13π6.052h+πr2hGiven: V2V1=1.2113π6.052h+πr2h13π52h+πr2h=1.216.052+r252+r2=1.216.052+r2=30.25+1.21r26.3525=0.21r2r2=6.35250.21r2=1214r=112=5.5 cmSo, r=5.5 cm=55mm

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