Shanika and Vanesa are comparing their electric bills for the past month. Shanika is on a standard use plan and Vanesa is on an interval use plan. Each person's usage is listed on the chart below:

C) Shanika pays $35.88 more than Vanessa.

Explanation:

This is because when doing the math, which is very simple, you can notice that, even though Shanika and Vanessa are using almost the same amount of energy during the 30 day period, the plan that Vanessa is using gives her an advantage regarding the on-peak and off-peak hours, which ultimately makes Shanika pay more than Vanessa.