A basic usage of the two different qualities named A and B which are to be used weekly as their normal usage is 300units, their maximum usage is 450 units and their minimum usage is 150 units, their reordering level of A is 2400units and for B is 3600units. And the reorder period is for A is 8 to 12 weeks as well as for B is 4 to 8 weeks. Find the reorder level?