Please help with part b and c!

The local Toyota dealer has to decide how many spare shock absorbers of a particular type to order for repairing Toyota automobiles. This shock absorber has a demand of four units per month and costs $25 each. The carrying charge is 30 percent per year, and the ordering cost is $15 per order. a. What is the EOQ for this item? (Round answer up to the nearest integer.) Answer is complete and correct. b. How often will the dealer reorder this part? (Round answer to 2 decimal places.) Answer is not complete. c. What is the annual cost of ordering and carrying this part? (Round answers to 2 decimal places.)