David found a new part-time job that pays $2400/month. This is 5 times what he made at his previous job. What was David’s yearly salary at his old job?

Answer 1

Let x be David's monthly salary at his old job.
His new salary is 5*x=2400.
So his old salary was x=2400/5=<<2400/5=480>>480 dollars.
So his yearly salary was 480*12=<<480*12=5760>>5760 dollars. Answer: \boxed{5760}.