A spherical lead ball of radius 10 cm is melted and small

A spherical lead ball of radius 10 cm is melted and small lead balls of radius 5 mm are made. The total number of possible small lead balls. ?

Number of balls = Volume of big ball / Volume of 1 small ball
= [4/3 x π x 10 x 10 x 10] / [4/3 x π x 0.5 x 0.5 x 0.5]
= 8000