Question

5. Ramesh painted a picture on the cardboard of length 3 m and width 2 m leaving a
margin of 20 cm along each of its sides. Find the total area of margin. Also find the
cost of painting by Ramesh at the rate of 500 per m2.
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Answer 1

Answer:

Total area of margin= 20x20=400 cm^2

= 400/100x100

=0.04m^2

Cost of painting= (3x2 =6m^2)

6x500=3000 rupees.

Answer 2

Answer:

Total area of margin = 2.16 square meters.

The cost of painting by Ramesh at the rate of 500 per square meters

= ₹3,000.

Step-by-step explanation:

Ramesh painted a picture on the cardboard of Length 3 m and width 2 m.

He left a margin of 20 cm along each of its sides.

Length including margin at the two ends = 3 m + 2x20cm = 3.4 m

Width including margin at the two ends = 2 m + 2x20cm = 2.4 m

Therefore, total area of margin:

= Total area including margin - Area without the margin

= (3.4x2.4 - 3x2) square meters

= [(3 + 0.4)x(2 + 0.4) - 3x2] square meters

= [(3x2 + 2x0.4 + 3x0.4 + 0.4x0.4) - 3x2] square meters

= [3x2 - 3x2 + 0.4(2+3) + 0.16] square meters

= (0.4x5 + 0.16) square meters

= (2.0 + 0.16) square meters

= 2.16 square meters

The cost of painting by Ramesh at the rate of 500 per square meters

₹$(3).(2).500$  = ₹3,000.