###Human: James buys 3 dirt bikes for $150 each and 4 off-road vehicles for $300 each.  It also cost him $25 to register each of these.  How much did he pay for everything?, ### Assistant: The dirtbikes cost 3*150=$450
The off-road vehicles cost 300*4=$1200
He had to register 3+4=7 vehicles
That means registration cost 25*7=$175
So the total cost of everything was 450+1200+175=$1825 
 So the answer is :  1825