A factory worker earns ₦50,000 per month out of which he spends 15% on his children's education, ₦13,600 on…

Analyze the question: The worker's monthly income is ₦50,000. We need to subtract three expenses (education, food, electricity) and find what remains.

Concept: Percentage of an amount = (percentage/100) × amount. Then subtract all expenses from the income.

Solution:

1. Education: 15% of ₦50,000 = 0.15 × 50,000 = ₦7,500
2. Food: ₦13,600 (already given in naira)
3. Electricity: 3% of ₦50,000 = 0.03 × 50,000 = ₦1,500

Total spent = 7,500 + 13,600 + 1,500 = ₦22,600

Amount left = 50,000 − 22,600 = ₦27,400

Tip: When a question mixes percentages and fixed amounts, convert every percentage to naira first, add up all expenses, then subtract once from the total. This reduces mistakes. You can also check quickly: 15% + 3% = 18% of 50,000 = ₦9,000, and 9,000 + 13,600 = 22,600.