The diploid human genome

The diploid human genome comprises 6.4 x 109 bp and fits into a nucleus that is 6 μm in diameter.
1.  If base pairs occur at intervals of 0.34 nm along the DNA helix, what is the length of DNA in a human cell?
2.  If the diameter of the DNA helix is 2.4 nm, what fraction of the volume of the nucleus is occupied by DNA?