i need help on this question

Mindy is looking to buy a used car and know that 80% of the cars in this market are good used cars and 20% are defective. The value of a good used car is $15,000 and the value of a defective used car is $8,000. 1. If Mindy can't tell the quality of the car before she buys it, what is the expected value for cars in this market? 2. If the market price is $8,000 will Mindy buy a car? 3. If you were the owner of a good car, how could you credibly communicate the quality of your car to potential buyers