Final answer:
The daily energy consumption for the bulbs and fans is 3.5 kWh. Multiplying by 30 days for a month, the total energy consumption is 105 kWh. At $0.05 per unit, the monthly cost would be $5.25, but this does not match the provided options, suggesting a potential error in the cost per unit or missing information.
Step-by-step explanation:
To calculate the cost of electricity for running bulbs and fans in an office for a month, first, determine the daily energy consumption. Six 25 W bulbs and two 100 W fans running for 10 hours a day would result in:
Energy consumed by bulbs per day = 6 bulbs × 25 W × 10 hours = 1500 Wh = 1.5 kWh
Energy consumed by fans per day = 2 fans × 100 W × 10 hours = 2000 Wh = 2 kWh
Total daily energy consumption = 1.5 kWh + 2 kWh = 3.5 kWh
Total monthly energy consumption = 3.5 kWh/day × 30 days = 105 kWh
Given the cost is 5 k (assumed to be $0.05) per unit (kWh), monthly electricity cost = 105 kWh × $0.05/kWh = $5.25.
However, there seems to be a mismatch between the given options and the calculated cost. Please review the cost per unit or check if additional information is provided in the problem statement that may affect the final calculation.