A company manufactures a unique type of component (STC) used in injection molding of medium-sized medical devices. By the start of week 6, a hundred STC must be ready to deliver. Each STC requires two sub-component A and four sub-component B. The lead time of STC is one week, and there are ten units on-hand. Sub-component A has a lead time of two weeks, and there is in-hand thirty units. Last, there are fifty units of Sub-component B, which has a lead time of one week. If at the beginning of week 6, one hundred STC is required, what is the net requirement for sub-component B to satisfy this order?