Question

A landlord has a 40W electric light bulb, four 60W bulbs in his house. If he has all the bulbs on for 5 hours daily and if the light bill charges 5000 per unit, what will be his bill for 30 days?

a. $2500
b. $5000
c. $7500
d. $10000

Answer 1

The landlord's bill for 30 days will be $7000.

Step-by-step explanation:

To calculate the landlord's bill for 30 days, we need to first calculate the total energy consumed by all the bulbs in 5 hours. The 40W bulb will consume 40W x 5 hours = 200 watt-hours.

The four 60W bulbs will consume 60W x 4 bulbs x 5 hours = 1200 watt-hours. Therefore, the total energy consumed by all the bulbs is 200 + 1200 = 1400 watt-hours.

To convert watt-hours to kilowatt-hours (kWh), we divide by 1000: 1400 watt-hours / 1000 = 1.4 kWh.

The cost per unit is given as $5000. So, to calculate the bill for 30 days, we need to multiply the cost per unit by the energy consumption: $5000 x 1.4 kWh = $7000.

Therefore, the landlord's bill for 30 days will be $7000.