A particular household utilizes three electrical appliances for six hours daily if the appliances are rated…

Analyze the question: Three appliances (80 W, 100 W, 120 W) each run 6 hours daily for 31 days. The energy cost is ₦24.08 per kWh. We need the monthly bill.

Concept: Energy (kWh) = Power (kW) × Time (hours) Cost = Energy × Rate

Solution:

1. Total power = 80 + 100 + 120 = 300 W = 0.3 kW

2. Energy used per day = 0.3 kW × 6 h = 1.8 kWh

3. Energy used in 31 days = 1.8 × 31 = 55.8 kWh

4. Cost = 55.8 × ₦24.08 = ₦1343.664 ≈ ₦1343.66k

Check: 55.8 × 24 = 1339.2 and 55.8 × 0.08 = 4.464, so the total is 1343.664. ✓

Tip: In electricity-bill questions, always follow this chain: add the powers → convert W to kW (divide by 1000) → multiply by hours → multiply by days → multiply by the cost per kWh. Most mistakes come from forgetting to convert watts to kilowatts. Option D (₦46.23k) is the kind of wrong answer you'd get from a slip in the conversion or in the number of days.