Question

If the dimensions of a rectangular room are 10×12×9 metres ,then the cost of painting its four walls at the rate of 8 per m² ​

Answer 1

Answer:

$rupees \: \: 3168$

Step-by-step explanation:

$surface \: area \: of \: the \: four \: walls \: = \: 2(l + b)h \\ = 2(10 + 12) \times 9 \\ = 2 \times 22 \times 9 \\ = 44 \times 9 \\ = 396 \: {m}^{2} \\ \\ \\ cost \: of \: painting \: = \: 8 \times 396 \\ = rupees \: \: 3168$