K-pro automotive shop purchases 120,000 oil filters annually which are sold at an average of 400 per day over the course of a year at its national retail outlets. if the annual holding cost is fifty cents per filter, and the ordering cost is $75 per order, what is the reorder point? (assume 300 days in a year and a lead time of 4 days).
a 15 filters
b 400 filters
c 1600 filters
d 6000 filters