Lady Bug Machineries Uses a Lean Production Assembly Line to Make

Lady Bug Machineries uses a lean production assembly line to make its generators. In one assembly area, the demand is 200 parts per 8-hour day. It uses a container that holds 10 parts. It typically takes about 5 hours to round-trip a container from one work center to the next and back again. They also desire to hold a 20% safety stock of this part in the system.
-If the container size is 15 and there are 10 containers, what will be the demand per hour, all else being constant?

A) 240 parts
B) 100 parts
C) 25 parts
D) 30 parts
E) 200 parts