Question

The dimensions of a room are $10$ m $\times 7$ m $\times 5$ m. There are $2$ doors and $3$ windows in the room. The dimensions of the doors are $1$ m $\times 3$ m. One window is of the size $2$ m $\times 1.5$ m and other two windows are size $1$ m $\times 1.5$ m. The cost of painting the walls at Rs. $3$ per ${\text{m}}^2$ is

• A. Rs. $474.00$
• B. Rs. $578.00$
• C. Rs. $648.00$
• D. Rs. $849.00$

Answer 1

The correct option is A Rs. $474.00$

Area of 4 walls
$=10\times 5+10\times 5+7\times 5+7\times 5=170m^2$
Area of doors and windows
$=2\times 1\times 3+2\times 1.5+2\times 1\times 1.5$
$=(6+3+3)m^2$
Area to be covered
$=(170-12)m^2=158m^2$
Cost of painting
$=Rs.(3\times 158)=Rs.474$