A man spends 35% of his income on food ,25% in children's education and 80% of the remaining on house rent.
What percent of his income he left with ?
Let the total income be `x`
Then, income left = (100 - 80)% of [100 - (35 + 25)[% of `x` = 20% of 40% of `x`
= `(20/100 xx 40/100 xx 100)`% of `x` = 8% of `x`.
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