(15. Find the cost of painting the border of a rectangular
board of length 4 m and breadth 2.5 m at the rate of
$120 per m.
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Step-by-step explanation:
length of rectangular board =4m
breadth of rectangular board= 2.5 m
Area of rectangular board= lb
= 4 X 2.5 = 10 m^2
Rate of painting= $120 m^2
Therefore, the cost of painting = $120 X 10 = $ 1200.
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