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The length and breadth of a rectangular plot are $900 m$ and $700 m$ respectively. If three rounds of fence are fixed around the field at the cost of $Rs$ . $8$ per metre, then find the total amount spent.

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Rs . 768

Rs . 7680

Rs . 76800

Rs . 768000

answer is C.

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Detailed Solution

Given that

l = 900, b = 700

. And the cost is

Rs

8

per metre.
Perimeter =

2 (l + b)

, where, l and b are the length and breadth of the rectangle respectively.
Perimeter

= 2 (900 + 700)

\Rightarrow P erimeter = 2 (1600)

\Rightarrow Perimeter = 3200

m
Three rounds of fence are fixed so,
Total amount

= 8 \times 3 (3200)

\Rightarrow

Total amount

= 9600 \times 8

\Rightarrow

Total amount

= Rs . 76800

So, the total amount spent is Rs.

76800 .

Hence, the correct option is 3.

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