A man spends 35% of his income on food, 25% on children’s education, and 80% of the remaining on house rent. What percent of his income is he left with?

The man spends 35% + 25% = 60% initially. Remaining income is 100% - 60% = 40%. He spends 80% of this remaining 40% on rent, which is 0.80 * 40% = 32%. Total spent is 60% + 32% = 92%. Thus, he is left with 100% - 92% = 8% of his income.