12. A plain carpet 10 m long and 6.5 m wide has a border of width 75 cm along each of its sides. Find the total area of the border.
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Plain carpet;
External dimensions
l = 10m = 1000cm
b = 6.5m = 650cm
Area of plain carpet = A1
A1 = 1000 × 650
= 650000cm²
Width of border along each side = 75cm
Internal dimensions
l = 1000-75
=925cm
b=650-75
=575cm
Area of carpet without border = A2
A2=925×575
= 531875cm²
Area of border = A1-A2
= 650000 - 531875
= 118,125cm²
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