2 / 2 pts Potter Company manufactures books . Manufacturing a book takes 10 units of B1 and 1 unit of B2 . Scheduled production of books for the next two months is 1,000 and 1,200 units , respectively . Beginning inventory is 4,000 units of B1 and 30 units of B2 . The ending inventory of B1 is planned to decrease 500 units in each of the next two months , and the B2 inventory is expected to increase 5 units in each of the next two months . Based on this information , the number of units of B1 that needs to be purchased during the first month is 1,000 units .,10,500 units .,9,500 units .,10,000 units