Answer:
The cheapest route to visit each city and return home again to Athens is:
A→B→C→D→A or A→D→C→B→A.
Step-by-step explanation:
The Algorithm of Brute Force
Let Athens ⇒A , Buford ⇒B , Cuming ⇒ C , Dacula ⇒ D
There are 6 routes to visit each city and return home again to Athens.
Route 1: A→B→C→D→A = 70 + 25 + 30 + 60 = $185
Route 2: A→B→D→C→A = 70 + 70 + 30 + 50 = $220
Route 3: A→C→B→D→A = 50 + 25 + 70 + 60 = $205
Route 4: A→C→D→B→A = 50 + 30 + 70 + 70 = $220
Route 5: A→D→B→C→A = 60 + 70 + 25 + 50 = $205
Route 6: A→D→C→B→A = 60 + 30 + 25 + 70 = $185
By checking the previous routes:
The cheapest charge will be $185 and it will be for the route
A→B→C→D→A or A→D→C→B→A.