Titanium goes through a polymorphic change from BCC to HCP crystal structure upon cooling through 882C. Calculate the percentage change in volume when the crystal

Titanium goes through a polymorphic change from BCC to HCP crystal structure upon cooling through 882ºC. Calculate the percentage change in volume when the crystal structure changes from BCC to HCP. The lattice constant a of the BCC unit cell at 882ºC is 0.332 nm and the HCP unit cell has a = 0.2950 nm and c = 0.4683 nm.