Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: Piravena must make a trip from $A$ to $B$, then from $B$ to $C$, then from $C$ to $A$.  Each of these three parts of the trip is made entirely by bus or entirely by airplane.  The cities form a right-angled triangle as shown, with $C$ a distance of 3000 km from $A$ and with $B$ a distance of 3250 km from $A$. To take a bus, it costs Piravena $\$0.15$ per kilometer. To take an airplane, it costs her a $\$100$ booking fee, plus $\$0.10$ per kilometer. [asy]

pair A, B, C;

C=(0,0);

B=(0,1250);

A=(3000,0);

draw(A--B--C--A);

label("A", A, SE);

label("B", B, NW);

label("C", C, SW);

label("3000 km", (A+C)/2, S);

label("3250 km", (A+B)/2, NE);

draw((0,125)--(125,125)--(125,0));

[/asy]

Piravena chose the least expensive way to travel between cities.  What was the total cost?
user