A poster measuring 20 cm x 16 cm is pasted on a sheet of cardboard such that there is a margin of 3.5 cm along each side of the poster. Find (a) the total area of the margin. (b) the cost of cardboard used at the rate of 1.50 per sq cm
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The length of the poster is 20 cm + 3.5 cm + 3.5 = 27cm
The width of the poster is is 16 cm + 3.5cm + 3.5cm = 23cm
a)Area of margin - area of poster
= (27cm x 23cm) - (20cmx16cm)
=621cm^2 - 320cm^2
=301cm^2
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