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: Triangle $ABC$ has its vertices $A$, $B$, and $C$ on the sides of a rectangle 4 units by 5 units as shown. What is the area of triangle $ABC$ in square units?

[asy]

fill((0,1)--(4,0)--(2,5)--cycle,lightgray);

for(int i=1; i < 5; ++i){
for(int k=1; k < 4; ++k){
draw((0,i)--(4,i),dashed);
draw((k,0)--(k,5),dashed);
} }

draw((0,0)--(4,0)--(4,5)--(0,5)--(0,0));

draw((0,1)--(4,0)--(2,5)--(0,1));

label("$A$",(0,1),W);
label("$B$",(4,0),SE);
label("$C$",(2,5),N);

[/asy]
user