security.rb

# That apartment is nice but it's outside your "40 x rent" limit.
# How much more are you gonna have to pay?
# NOTE: I Am Not A Broker, I'm only *pretty* sure this is how it works,
# calculate at your own risk.

def security(rent, salary)
  normal_security = rent * 2
  
  base_rent = salary / 40.0
  
  extra_security = (rent - base_rent) * 10

  months = [((normal_security + extra_security) / rent.to_f).ceil, 2].max
  
  months * rent
end