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: Rose fills each of the rectangular regions of her rectangular flower bed with a different type of flower. The lengths, in feet, of the rectangular regions in her flower bed are as shown in the figure. She plants one flower per square foot in each region. Asters cost $\$1$ each, begonias $\$1.50$ each, cannas $\$2$ each, dahlias $\$2.50$ each, and Easter lilies $\$3$ each. What is the least possible cost, in dollars, for her garden? [asy]
draw((0,0)--(11,0)--(11,6)--(0,6)--cycle,linewidth(0.7));
draw((0,1)--(6,1),linewidth(0.7));
draw((4,1)--(4,6),linewidth(0.7));
draw((6,0)--(6,3),linewidth(0.7));
draw((4,3)--(11,3),linewidth(0.7));
label("6",(3,0),S);
label("5",(8.5,0),S);
label("1",(0,0.5),W);
label("5",(0,3.5),W);
label("4",(2,6),N);
label("7",(7.5,6),N);
label("3",(11,1.5),E);
label("3",(11,4.5),E);
[/asy]
user