Question : The pie chart shows the cost of construction of a house in degree.
What is the average expenditure on timber, supervision and cement?
Option 1: 20%
Option 2: 21%
Option 3: 10%
Option 4: 15%
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Correct Answer: 15%
Solution :
Percentage share of a material = $\frac{\text{Given angle} }{360} \times 100$
So, Timber = $\frac{36\times 100}{360} = 10$%
Supervision = $\frac{54\times 100}{360} = 15$%
Cement = $\frac{72\times 100}{360} = 20$%
$\therefore$ Average expenditure = $\frac{10+15+20}{3} = 15$%
Hence, the correct answer is 15%.
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