the ratio of income to the expenditure of a family is 9:4. find the income if the saving is ruppes 3600???

So, suppose the income and expenditure are 9

*x*and 4

*x*respectively.

Then saving amount = 9

*x*- 4

*x*= 5

*x*

And the given saving amount is Rs.3600. so we have;

$5x=3600\phantom{\rule{0ex}{0ex}}\Rightarrow x=\frac{3600}{5}=720$

Therefore the income = $9\times 720$ = Rs.6480

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