4、A mover needs to transport 200 buns from the kitchen to the construction site (he is currently in the kitchen), and he can carry 40 buns each time. However, since he is very greedy, he will eat 1 bun whether he is walking from the kitchen to the construction site or from the construction site back to the kitchen. How many buns can this mover transport to the construction site at most?
【Answer】191
Analysis: $200 \div 40=5$ times, but no need to return to the room for the last time, so he eats $2 \times 5-1=9$ buns, leaving $200-9=191$ buns