QUESTION 18 "The cost for a standard size concrete block (400 x 200 x 200) is $ 5.56 (including material & labour). Assuming a 5% waste for concrete blocks, what is the cost for 1 m2 of concrete block wall (excl. mortar and accessories)?" O $69.50 O $72.98 O $73.56 O $68.63 O None of the above QUESTION 19 How many bricks of size 90 mm (W) x 70 mm (H) x 190 mm (L) are there per one square meter of wall area when the mortar joint is 10mm thick? O 113 bricks O "1,125 bricks" O 75 bricks O 63 bricks None of the above-