Product A is assembled from 3 components: E (4 units needed to make one unit of A), H (10 units), and B (1 unit). B is made of D (10 units) and C (5 units). D is made of H (20 units). C is made of H (10 units). Currently 25 units of B and 6000 units of H are in stock. In order to make 450 units of A, how many units of H is needed?.