the internal measure of a cuboidal room are 18m×16m×8m find the tota

1.	the internal measure of a cuboidal room are 18m×16m×8m find the total cost of whitewashing if the cost of whitewashing is 7rs per meter.what will be it's cost if ceiling is also whitewashed
Answer» ANSWER: TSA of CUBOID = $2(lb + lh + bh)$ $= 2(18 \times 16 + 16 \times 8 + 18 \times 8)$ $= 2(288 + 128 + 144)$ $= 2 \times 560 = 1120$ so, floor will not be WHITE washed , $tsa \: - l \times b \\$ $= 1120 - 288 = 832$ so cost of white washing is, $= 832 \times 7 = rs. 5824$ $mark \: brainliest$