Peter, a second-hand car dealer, purchased a car in the wholesale market for $15,000. Peter contracted to sell the car to David for $20,000, but David refused to take delivery of the car. Peter sued David for breach of contract. Requirement:

(1)What damages can Peter claim?

(2)If Peter later sells the car to another purchaser for $18,000, what damages, if any, would Peter be entitled to?

Though answers are given, there is no proper justification. Can you explain in details the justification : 1. Issue 2. Principle 3, Case 4. Application 5. Conclusion