Question

Find the cost of fencing a regular flower bed of length 10 m and breadth 5 m by three rounds of barbed wire at the rate of ₹50 per metre.​

Answer 1

Given :-

• length, l = 10 m
• breadth, b = 5 m
• rate = Rs. 50 per meter

To Find :-

• the cost of fencing a regular flower bed by three rounds.

solution :-

we know that,

$\boxed{ \bold{perimeter \: of \: rectangle = 2(l + b)}}$

$\bold{ : \implies 2(10 + 5) } \\ \\ \bold{: \implies 2 \times 15} \: \: \: \: \: \: \\ \\ \bold{: \implies 30 } \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

so, perimeter of flower bed is 30 m

then,

required wire for fencing 3 rounds = 3 × 30 m = 90m

so, length of required barbed wire is 90 m

now, cost of fencing = Length of wire × rate

$\bold{: \implies 90 \times 50} \\ \\ \bold{: \implies 4500} \: \: \: \: \:$

hence, cost of fencing is Rs. 4500