3. A path 4 m wide runs along inside a square park of side 80 m. Find the area of the path. Also find the cost of cementing the path at rupees 200 per m²
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given inner side of the square park =s =80m
area of inner square =s²=80²=1600m²
width path=w=4m
outer side of square =80+4+4=88m
area of outer square =88²=7744m²
area of the path=7744-1600=6144m²
cost of cementing at he rate of ₹200 per m²=6144×200
=₹1,228,800
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