17. A rectangular piece of land measures 0.8 km by 0.6 km. Each side is to be fenced with
three rows of wire. Find the length of the wire needed. If the cost of fencing is 250 per
metre, find the total cost of fencing the land.
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Solution:
The perimeter of a rectangular piece of land = 2(Length + Breadth)
= 2(0.7+0.5)
= 2(1.2)
= 2.4 km
\because1km\ =\ 1000m
\therefore0.24\ =\ 1000\times0.24=2400 m.
Since 4 rows of wire is required.
\therefore2400\times4=9600 m.
\therefore9600\ m\ =\ 9.6\ km
Therefore, length of wire required is 9.6 km or 9600 m.
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