Question

Your gas company charges you a standing charge of 9 pence per day and 2 pence per kilowatt-hour (KWh).
In the last quarter (90 days) you used 500 units (m3) of gas. 1 unit is approximately 11.1KWh.
How much is your bill for the last quarter?

Answer 1

Answer:

$8.10 + 55.50 x $2 KW

= 8.10 + 111.00 = $119.10  

Step-by-step explanation:

d = days and x = kw/h

9d = 2x = 9(90) = 500m3

1 unit m3 =  11.1 kwh

We rewrite

9(90) = 500 x 11.1

500 x 11.1 = 5550 KW

0.09 x 90 = 5550 KW

8.1 + 5550 x 0.02

= 8.1 + 111 KW  

= 119.10

= $119.10