What is the fill height for A$5?$

What is the fill height for B$5?$

What is the fill height for A$6?$

What is the fill height for B$6?$

What is the average fill height for grid $20?$

What is the total area for grid $20?$

What is the total volume of fill for grid $20$ in cubic feet?

If there were $9$ other sections similar to Grid $20,$ calculate the total fill volume for all ten sections.

$($grid is $100\text{'}$ x $100\text{'})$