Hello,

To convert a physical quantity from one system to other -

n1[u1]=n2[u2]

where,

n2 = n1( [m1/m2]^a)( [l1/l2]^b)([t1/t2]^c)

therefore,

n1[u1]=n2[u2]

4 g/cm3=n^2(100/(10)^3)=n2=40

therefore the density of material will be 40 g/cm3.

This is how the density of the material can be deduced.

Hope this helps.

All the best!