The ratio of income and expenditure of a person is 11:10. If he saves IRS. 9,000 per annum. his monthly income is:
let's say income is $$11x$$ and expenditure is $$10x$$ hence saving will be $$x$$
so when saving is $$x$$, annual income is $$11x$$
now when saving is 9000 , annual income will be  99000
and monthly income will be 8,250
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