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Answer:
volume of milk container = 1/3πh(R²+r²+Rr)=10459.43 cm³
= 1/3×22/7×h(400+64+160)=10459.43
=1/3×22/7×h×624=10459.43
h=10459.43×21/22×624=16cm
h=16cm
l=√h²(R-r)²
=√256+144
=20cm
Cost =3218.23×1.40
=Rs.4505.522
= Rs.4505.5 (approx)