Explain each question please!

6. What would be the reorder point for a 90% service level? a. between 115 and 135 b. between 620 and 640 c. between 2115 and 2135 d. between 2060 and 2070 c. between 560 and 570 7. If the lead-time is cut in half and service level is kept at 90%, the reorder point will become: a. between 2080 and 2100 b. between 80 and 120 c. between 1050 and 1079 d. between 580 and 600 e. between 1080 and 1100 8. For the original lead-time (4 weeks), it is desired to increase the service level to 97%. The reorder point will increase by approximately: a. 7 percent b. 50 percent c. a factor of 1.10 d. 3 percent c. a factor of 1.15 9. From your calculations in question 8 , the amount of safety stock will increase by approximately: a. 7 percent b. 50 percent c. a factor of 1.10 d. 3 percent c. equal to 1.00+0.5