A concrete masonry unit is tested for compressive strength and produces the following results:

Failure load $=726kN$

Gross area $=0\mathrm{.}081m^2$

Gross volume $=0\mathrm{.}015m^3$

Net volume $=0\mathrm{.}007m^3$

a$.$ Is the unit categorized as solid or hollow? Why?

b$.$ What is the compressive strength?

c$.$ Does the compressive strength satisfy the ASTM requirements for load bearing units shown in the Table below:

$\backslash$table$[[,\backslash$table$[[$Minimum Compressive Strength$],[$Based on Net Area MPa$]]],[$Type$,$Average of Three Units,Individual Units$],[$Load bearing,$13\mathrm{.}1,11\mathrm{.}7],[$Non$-$load$-$bearing,$4\mathrm{.}1,3\mathrm{.}5]]$