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2015-12-11T21:07:08+05:30
For household = 70/100 . 5500 = Rs. 3850
,,    children    =  25/100 . 5500 = Rs. 1375
total expenditure = 3850+1375 = Rs. 5225
savings = 5500 - 5225 = Rs. 275
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2015-12-12T11:03:50+05:30

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Method 1. (long method)
household expenses = (70/100)×5500 = RS 3850
on children = (25/100)× 5500 = 1375
money saved = income - total expenses
                       = 5500 - ( 3850 + 1375) 
                       = 5500 - 5225
                       = 275
money saved = Rs 275

Method 2 ( simplest )
total expenses = 70% + 25%
                        =95 % 
means, Mr Arun saved (100 -95)% = 5%
so, 5 % of Rs 5500 = (5/100)×5500
                                = Rs 275
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