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Suresh earns Rs. 72000 per month. Distribution of his monthly earning is presented in the following pie-chart.

How much money he spends on household expenditures every month?
The household expenditure sector has an angle of $$144^\circ$$ out of $$360^\circ$$. So he spends $$\frac{144}{360} \times 72000 = 28800$$ rupees on it.
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