If lintel blocks are required wherever the #$4$ horizontal bars are located, how many plain blocks and how many lintel blocks are needed for the wall?

Find the area of the wall as follows:

$.$ Determine the number of modular bricks needed for the wall in Figure $12\mathrm{.}25.$

Assume that $675$ bricks are required for $100$ square feet of wall.

Add $4$ percent for waste.

Find the net area of the wall and number of bricks as follows:

METALS:

$.$ What two materials are most commonly used for structural framing metals, and how are they priced?