4. Given the following Mast production schedule, a) compute the available-to-promise quantities. Model B BI Week 0 1 2 3 4 5 6 7 8 MPS 20 0 20 20 10 20 20 Committed orders 10 10 0 10 30 0 10 20 Inventory ATP: Cummulative ATP:D 0 b) (added) If a new customer called to place an order of 10 units in week 4, can you accept the order without changing your MPS? c) (added) Given you committed the new order made in b), another customer place an order of 20 units in week 5, can you accept the order without changing your MPS?