Price reduced 40% then increased 25%. Net change: MCQ with Answer and Explanation

Explanation:
Food 40%, left 60%. Rent 30% of 60% = 18% of income. Total spend = 58%, save 42% = 3780 → income = 3780/0.42 = 9000.

Explanation:
Population = 5000 * (1.20)^2 = 5000 * 1.44 = 7200.

Explanation:
Rent 20%, left 80%. Food 25% of 80% = 20% of income, left 60%. Education 30% of 60% = 18% of income, left 42% = 8400 → income = 8400/0.42 = 20000? Wait, 8400/0.42 = 20000. So income 20000, option B. But I set D as 25000. Let's recalc: 42% = 8400 → income = 20000. So answer B. I'll correct options: A 18000, B 20000, C 22000, D 25000. So answer B.