4.Julia brings home $2400 per month after taxes. Her rent is $700 per month, her utilities are $200 per month, and her car payment is $350 per month. Julia is cur

rently paying $200 per month to her orthodontist for maintenance of her braces.

a. If Julias groceries cost $100 per week and she estimates her other expenses to be $300 per month, how much will she have left each month to put toward savings to reach her financial goals?

b. Julia is considering trading in her car for a new one. Her new car payment will be $375 per month, and her insurance cost will increase by $60 per month. Julia determines that her other car-related expenses (gas, oil) will stay about the same. What is the opportunity cost if Julia purchases the new car?