Concrete bids. Questions i should ask.

I got my first bid today on concrete.
$
I attached lay out from building supplier.
The concrete contractor did bid over
I told him about grade. 18" of fall for 30'.
1 min later he replied with .
Then i ask him how thick.
He said 4 inches with fiber.
He told me it was a cheap price ask when i wanted concrete done.
I ask him if he could breakdown the cost so i could understand where my money was going.
I called the local concrete supply.
$137 yard min 4 yards.
I did not ask about different grades or mixes. Just told them it was a garage floor.

In your alls opinion and experence what do i need as far as concrete?
What should i ask the contractor?
Thank you.

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1- Type of structure

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