a blackboard is 17dm7cm long and 11dm5cm broad. what will be the cost of painting it at the rate of 35 paise per square centimetre?
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Step-by-step explanation:
Rs. 712425
A black board is 17 dm 7 cm long and 11 dm 5 cm broad.
Here..
Length of board = 17 × 10 + 7
= 170 + 7
= 177 cm
Breadth of board = 11 × 10 + 5
= 110 + 5
= 115 cm
Now,
Area of blackboard = Area of rectangle
Area of rectangle = length × breadth
Substitute the known values in above formula
=> 177 × 115
=> 20355 cm²
Now,
Cost of painting the blackboard at the rate of 35 paise per cm²
=> 20355 × 35
=> Rs. 712425
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