Question

Find the cost at 7 1/2 per kw-hr:Sept.1: 12,725 kw-hr Oct. 1: 13,814 kw-hr Electric Bill:

Answer 1

If the cost per kw-hr is

`7\text{ }(1)/(2)=7.5`

Then, we can calculate the difference betweein the readings of October and September and multiply this for the cost per kw-hr.

So, the total kw-hr between this months is:

`x=13814-12725=1089`

So, if 1 kw-hr costs 7.5, then the total cost will be:

`7.5\cdot1089=8167.5`

Cost of $8,167.50.