7. A painting of dimension 140 cm by 80 cm is to be framed with 15 cm wide frame all
around its edges. Find the cardboard needed to be put at the back to support the
painting. Also find the cost of framing it at the rate of 120 per metre.
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l = 140 cm
b = 80 cm
therefore Area = l×B
= 140 ×80
= 11200 Sq.cm
Hence 11200 Sq. . cm is the area of required cardboard.
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