please , ive had this one done twice and both times incorrect

SY Manufacturers (SYM) is producing T-shirts in three colors: red, blue, and white. The monthly demand for each color is 1,875 units. Each shirt requires 0.75 pound of raw cotton that is imported from Luft-Geshfet-Textile (LGT) Company in Brazil. The purchasing price per pound is $1.85 (paid only when the cotton arrives at SYM's facilities) and transportation cost by sea is $0.40 per pound. The traveling time from LGT's facility in Brazil to the SYM facility in the United States is two weeks. The cost of placing a cotton order, by SYM, is $75 and the annual interest rate that SYM is facing is 24 percent. a. What is the optimal order quantity of cotton? (Round your answer to the nearest whole number.) Answer is complete but not entirely correct. b. How frequently should the company order cotton? (Round your answer to 2 decimal places.) Answer is complete but not entirely correct. c. Assuming that the first order is needed on 15-Aug, when should SYM place the order? 01-Aug 15.Aug sinx... 9. If the annual interest cost is only 5 percent, how will it affect the annual number of orders, the optimal batch size, and the average inventory? d. How many orders will SYM place during the next year? (Round your answer to 2 decimal places.) Answer is complete but not entirely correct. e. What is the resulting annual holding cost? (Round your answer to the nearest whole number.) Answer is complete but not entirely correct. f. What is the resulting annual ordering cost? Answer is complete but not entirely correct