Question

what will be the cost of using some for 1 month if one unit of electricity cost rs 4.

Answer 1

Ask him to apply for separate meters for each flat or each floor atleast. Electricity sub-meter can also be installed for separate rooms and deducted accordingly. These all things should be kept in mind before renting. If not, its the tenant's fault, not landlord's.

In your case since separate meters are already installed, check for reading and bill of individual meter. And dont pay anything over that bill.

Answer 2

Example:

Suppose, a consumer consumes 1000 watts load per hour daily for one month. Calculate The Total Energy bill of the consumer if per unit rate is 9 (In $, £, €, INR ,Rs, DHR, Riyal etc) [Take 1 month = 30 Days].

Solution:

1unit = 1kWh.

So Total kWh = 1000 Watts x 24 Hrs x 30 Days = 720000 watts/hour.

we Want to convert it into Units, Where is 1unit = 1kWh.
So total Consumed units. 720000/1000…… (k=kilo=1000).
Total Units = 720.
Cost of per unit is 9.

So total Cost or Electricity bill= 720 x 9 = 6480. (In $, £, €, INR ,Rs, DHR, Riyal etc). You have Done

it is the example do like this