A company received tow shipments of ball bearings. In the first shipment 1 percent of the ball bearings were defective. In the second shipment, which was twice as large as the first, 4.5 Percent of the ball bearings were defective. If the company received a total of 100 defective ball bearings, how many ball bearings were in the first shipment? `990` b. `1000` c. `3000` d. 2000