Standard Use Plan
Interval Use Plan
8.5 cents/kWh for the first 400 kWh
12 cents/kWh for the next 400 kWh
14.5 cents/kWh for anything over 800 kWh
On-peak hours - 13 cents/kWh
Off-peak hours - 2 cents/kWh

Both families use 1250 kWh for the given 30 day period. The Freeman family uses 400 kWh during on-peak hours and 850 during off-peak hours. Which family ends up paying more for their utilities? How much more?