A half-block concrete masonry unit is subjected to compression until failure. The outside dimensions of the specimen are 190 mm * 190 mm * 190 mm. The cross section is a hollow square with a wall...

A half-block concrete masonry unit is subjected to compression until failure.
The outside dimensions of the specimen are 190 mm * 190 mm * 190 mm.
The cross section is a hollow square with a wall thickness of 38 mm. The load
is applied perpendicular to the hollow cross section and the maximum load
is 296 kN.
a. Determine the gross area compressive strength.
b. Determine the net area compressive strength.