Can you provide an in-depth solution for: 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?Hey there, could you help me solve this math problem: 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?