why the answer is D ?

Complete Mark 1.50 out of 1.50 13 s loaded on a some destine MG-2021 The demand for an item is steady at 1500 units per year. The ordering cost is OMR 16 per order, and the holding cost is 0.30 OMR/unit-year. What should be reorder point (level), if the lead time is 10 months? Round-up to the nearest integer .a 325 hamukh Cons ales of OMR 2 cock level of 21 nual holding a percent of cluding the com 5 million a yea lued at OMR te of returns on .b 278 MG-20211 .c None is correct .d 50 .e 231 Invento The correct answer is: 50