Step-by-step explanation & Answer:
It means he gets 150% of more money than he does right now.
If you solve how much money he will earn more with the percentage you would first have to turn the 150% into a decimal.
The decimal would become a 1.50.
Then you would do 400 × 1.50, which would equal 600.
600 is the amount of money he will make after the 150% percent raise.
So the final answer would be $600.