Use Logisim to construct a simple car park display board system at a shopping mall.

1. The parking spot has two levels consist of one entry in each level (two inputs). 2. The total number of parking spots is 200 (100 in each level). 3. The system can detect a car entering and leaving the parking spots. 4. The number of parking spots decreases every time a car enters the parking spots. 5. The number of parking spots increases back every time a car left the parking spots. 6. A display board will show the number of parking spots left in level one, level two, and the total of both levels (3 outputs).

Explain the working principle and all of the steps of the process used for the complete design. Describe the details of the design (i.e., K-maps, state diagrams/tables, logic equations). Insert also the picture of the Logisim.