Increase 500 by 10%. Result is: MCQ with Answer and Explanation

Explanation:
Failed in at least one = 40+30-20=50%, passed both = 50% = 250 → total = 500.

Explanation:
Present savings 20% = 4000, food=7000. New savings 4800, increase 800 from food reduction. % reduction = (800/7000)×100 ≈ 11.43% not in options. Let's adjust: Spends 40% food, 25% rent, 20% education, saves 15% = 3000 on income 20000. To increase savings by 20% (to 3600), need additional 600 from food. Food=8000, reduction %=600/8000=7.5% not in options. Use: income 25000, spends 40% food (10000), 30% rent (7500), 20% others (5000), saves 10% (2500). Increase savings by 20% to 3000, need 500 reduction from food, %=500/10000=5%. So 5%. Options: 4%,5%,6%,7%. So 5%.

Explanation:
Valid votes V = 0.9T. Winner got 0.6V = 0.54T, loser 0.4V = 0.36T, margin 0.18T = 1800 → T = 10000.