Question

The Baum and the Freeman families are comparing their electric bills for the past month. The Baum family is on a standard use plan and the Freeman family is on an interval use plan. Each family’s usage is listed on the chart below:
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?
a.
The Freeman family pays $260.83 more than the Baum family.
b.
The Freeman family pays $250.00 more than the Baum family.
c.
The Baum family pays $69.00 more than the Freeman family.
d.
The Baum family pays $78.25 more than the Freeman family.

Answer 1

D is the correct answer. I just got 100 on my test yoyo

Answer 2

The Freeman family:
13 c/kWh (400 kWh) + 2 c/kWh (400 kWh) + 14.5 c/kWh) 450 kWh
 = 6464.5 c
6464.5 c x 30 = 193935

The Baum family:
8.5 (400) + 12 (400) + 14.5 (450)
= 14725 c

The Freeman family pays $260.83 more than the Baum family.