So it's best in this case to separate both shapes so you have a rectangle and a triangle so to solve the area of a rectangle you do
The following ( picture )
So I hope this helps
Answer:
My total savings was = $58.33
Step-by-step explanation:
Given:
12% of my savings was = $7.00
To find my total savings.
Solution:
Let the total savings in dollars be = 
12% of the total savings will be = 
12% of my savings was = $7.00
So, we have:


Solving for
to get my total savings.
Dividing both sides by 0.12

∴ 
Thus, my total savings was = $58.33
Calculater I'm pretty sure
Cut the 4 corners off and you will have an 8-sided octagon