Los Angeles Landlords - What is a good ratio of rent to income

[Kaenan Whitman]

For the Los Angeles investors - I was curious  what rent to income ratios you use on your rental properties.  I know the rule of thumb for the average place is household income should be 40x's the monthly rent.  However I feel that in areas where rent is so high you probably don't need that same ratio to cover your other expenses.  Thanks