Question

A unit of electricity costs 13.2 pence. On average, tanya uses 90 units of electricity per week. She pays for her bill in 12 weeks. How much will her electricity bill be then?

Answer 1

14256 pence

Explanation:

Cost of electricity of a bill for 1 unit= 13.2 pence

Number of units used by Tanya in one week= 90 units

Total number of units in 12 weeks= 90×12= 1080 units

Cost of 1080 units= 1080×13.2= 14256 pence

Hence the total cost of a bill= 14256 pence

Hence, the correct answer is 14256 pence.

Answer 2

Her electricity bill will be of 14256 pence.

Explanation

On average, Tanya uses 90 units of electricity per week.

So, the total units of electricity in 12 weeks will be:
`(90*12)=1080` units

One unit of electricity costs 13.2 pence.

Thus, the total cost for 1080 units will be:
`(13.2*1080)pence= 14256` pence.

So, her electricity bill will be of 14256 pence.