S's expenditure is double the difference between his savings and expenditure. What percentage of his salary is his expenditure?
40%
Let salary=100, expenditure=E. Savings=100-E.
Given: \(E = 2(\text{savings}-E) = 2(100-E-E) = 200-4E\).
\(E+4E=200 \Rightarrow 5E=200 \Rightarrow E=40\).
Hence, expenditure is 40% of his salary.
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