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The income of a person is 10000 and its expenditure is 6000 and thus saves 4000rs. In the next year his income is increased by 10% and its expenditure increased by 20%. Now his saving is what percent lower than the previous saving.

7.5%

10%

15%

Explanation:

Initially I-E = S (I = Income, E = expenditure, S = saving)
10000-6000 = 4000(saving)
Now, I = 11000 and E = 7200. So saving = I – E = 3800.
[(4000-3800)/4000]*100 = 5%

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