Anna is trying to save some money on her electric bill. Her electric company has come up with a new plan designed to charge customers based on when they use electricity. She is trying to decide if the new interval use plan would be better than the standard use plan for her needs. Calculate the monthly costs of both plans if she uses $1,185\text{ kWh}$ of electricity per month with $500\text{ kWh}$ on-peak usage and the rest off-peak usage.

Standard Use Plan	Interval Use Plan
\begin{tabular}[t]{l} 8.5 cents/kWh for the first 600 kWh
11 cents/kWh for anything over 600 kWh

&

On-peak hours - 16 cents/kWh

Off-peak hours - 4 cents/kWh

\\

\hline

\end{tabular}

Astandard use plan - \$64.35; interval use plan - \$80.00

Bstandard use plan - \$115.35; interval use plan - \$107.40

Cstandard use plan - \$64.35; interval use plan - \$107.40

Dstandard use plan - \$115.35; interval use plan - \$80.00