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Answer:
answer is 421.8
Step-by-step explanation:
area of field=340
breadth=17
length=?
area of field=l×b
340=l×17
l=340/17
l=20
Perimeter of field=2(l+b)
=2(20+17)
=2×37
=74
total cost of fencing=5.70×74
=Rs.421.8
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