Nadia has a rectangular frame. The frame is 12 cm long and 8 cm wide. Nadia wants to put a ribbon around the frame. What will be the total cost of ribbon if 1m of it costs Rs 5?

Rs.215

Rs.180

Rs.20

None of these

Explanation

Length of the frame = 12 cm
Width of the frame = 8 cm

Perimeter of a rectangle = 2 × (length + width)

So, the perimeter $P$ is:
$P = 2 times (12 text{ cm} + 8 text{ cm})$
$P = 2 \times 20 cm$
$P = 40 text{ cm}$

Now, convert the perimeter from centimeters to meters (since the cost of ribbon is given per meter):
$text{Perimeter in meters} = frac{40 text{ cm}}{100}$
$text{Perimeter in meters} = 0.4 text{ m}$

Next, calculate the total cost of the ribbon:
Cost of 1 meter of ribbon = Rs 5

Total cost of ribbon = Cost per meter × Length in meters
$text{Total cost} = 5 times 0.4$
$Total cost = R s 2$

Therefore, the total cost of the ribbon Nadia needs is Rs 20.

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