The cost of concrete

I agree with Ddaddy in post #7
Get some estimates.
The cost of concrete and labor is different from area to area and contractor to contractor.
What we tell you could be way off from where you are.
Could be more or less.
You could multiply the length by width by thickness of the slab
That will give you the cubic footage then divide by 27 that will give you the cubic yards.
Then call the concrete company to check the cost per yard of concrete.That might give you a better idea.