Given the following product tree (the quantities are shown between brackets in the next page): B(3) C(2) C(1) D(1) The following data for A, B, C and Dis known: Stock Safety Stock Lot Size Lead Time A 10 20 1 30 50 2 400 The master production schedule calls for production of 15 A in period 1, 5 in period 2, 15 in period 3, 10 in period 4, and 15 in period 5. There is a scheduled receipt of 20 A in period 1, 50 B in period 2 and 90 C in period 2. 1. Calculate the MRP-explosion. (30 Marks) 2. Compare between MRP and ERP. (10 Marks)