Question

find the cost of fencing a rectangular field of length 420 m and breadth 360 m if the cost fencing is 5rs per meter

Answer 1

☆Hello friend☆
Let's take out perimeter of that field.
Perimeter of rectangle=2(l+b)
= 2(420+360)m= 2× 780m
=1560m
Cost of 1m = Rs 5
Cost of 1560m= 1560×5=Rs 7800.
$hope \: it \: helps$
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Answer 2

perimeter=2(420+360)
              =2*780
              =1560
cost of fencing = 1560*5
                          = 7800Rs