A household uses 1,100 kilowatt-hours of electricity in one month. After buying new energy-saving appliances, they reduced their use of electricity the next month by 14%.
How many kilowatt-hours of electricity did they use the second month?
A. 627 kWh
B. 154 kWh
C. 946 kWh
D. 473 kWh
To find the amount of electricity they used the second month, we need to multiply the amount used the first month by 1 minus the percent reduction (as a decimal).
Amount used the second month = 1,100 kWh * (1 - 14%) = 1,100 kWh * (1 - 0.14) = 1,100 kWh * 0.86 = 946 kWh
The correct answer is C. 946 kWh.
To find out how many kilowatt-hours of electricity they used in the second month, we need to subtract 14% of the first month's usage from the first month's usage.
Step 1: Calculate 14% of 1,100 kWh.
14% of 1,100 kWh = 0.14 * 1,100 kWh = 154 kWh
Step 2: Subtract 154 kWh from 1,100 kWh.
1,100 kWh - 154 kWh = 946 kWh
So, they used 946 kilowatt-hours of electricity in the second month.
Therefore, the answer is C. 946 kWh.
To find out how much electricity the household used in the second month, we need to calculate 14% of the electricity used in the first month and subtract it from the total.
1. First, we need to find 14% of 1,100 kWh.
To calculate this, we multiply 1,100 by 0.14:
1,100 kWh * 0.14 = 154 kWh
2. Next, we subtract 154 kWh from 1,100 kWh.
1,100 kWh - 154 kWh = 946 kWh
Therefore, they used 946 kilowatt-hours of electricity in the second month.
The answer is C. 946 kWh.