Question

A room $8cm$ long, $6cm$ broad and $3cm$ high has two window $1\frac{1}{2}m\times 1m$ and door $2m\times \frac{1}{2}m$ Find the cost of papering the walls with paper $50cm$ wide at $25p$ per meter.

• A. $Rs.40$
• B. $Rs.36$
• C. $Rs.44$
• D. $Rs.33$

Answer 1

The correct option is A $Rs.40$

Area of walls to be papered = Area of 4 walls - Area of 2 windows - Area of door

Dimensions of $2$ walls will be $8\times 3$ other two will be $6\times 3$

So Area of walls to be papered

$=2(8\times 3)+2(6\times 3)-2(\frac{3}{2}\times 1)-(2\times \frac{1}{2})$

$=84-3-1=80m^2$

length of paper required

$=\frac{80}{\frac{50}{100}}=160$

Cost $=160\times \frac{25}{100}=40$ Rs