To determine which house had the lowest cost per day, we can analyze the provided data.
For House 1, the costs given are:
- 6 days: $97.50 → cost per day = $97.50 / 6 = $16.25
- 8 days: $130.00 → cost per day = $130.00 / 8 = $16.25
- 12 days: $195.00 → cost per day = $195.00 / 12 = $16.25
For House 2, the graph represents a linear relationship, and we can read the accumulated costs:
- At 5 days, the cost is $75 → cost per day = $75 / 5 = $15.00
- At 10 days, the cost is $150 → cost per day = $150 / 10 = $15.00
- At 15 days, the cost is $225 → cost per day = $225 / 15 = $15.00
- At 20 days, the cost is $300 → cost per day = $300 / 20 = $15.00
- At 25 days, the cost is $375 → cost per day = $375 / 25 = $15.00
- At 30 days, the cost is $450 → cost per day = $450 / 30 = $15.00
From this analysis:
- House 1 has a consistent cost per day of $16.25.
- House 2 has a consistent cost per day of $15.00.
Comparing the costs per day, House 2 has the lower cost of $15.00 compared to House 1’s $16.25.
Thus, the answer is: House 2 had the lowest accumulated electricity cost per day.