<prompt> Human: For example if I have a yearly income of 40.000 and I spend 300 per month for food that would be 9 of my yearly income.How much of my income should I spend for a car? How much for rent?Is there some kind of a rule of thumb for those things?I know there might not be a general answer, because it can depend a lot from where you are living.  <response>: 25-30 is an often repeated general guideline for housing expenses.10 and under for car expenses car payments, insurance, parking, gas, etc.10 minimum for savings.Almost always recommended as after-tax income.Those are the only two I can think of. 