Question

The cost of flooring a rectangular hall at $Rs64$ per square meter is $Rs2,048$. If the breadth of the hall is $5m$, find
(i) its length
(ii) its perimeter
(iii) cost of fixing a border of very small width along its boundary at the rate of $Rs60$ per square metre.

Answer 1

Cost of flooring $=Rs64$

Total cost of flooring $=Rs2048$

Breadth $=5m$

$\Rightarrow$

(a) $l\times b\times 64=2048$

$l\times 5\times 64=2048$

$l=\frac{32}{5}$$=6.4m$

(b) perimeter = $2(l+b)=2(6.4+5)$

$=2\left(11.4\right)=22.8m$

(c) cost of fixing border $\Rightarrow$ Area of hall$\times$ Rs $60m$

$=Rs60\times 32$

$=Rs1920$