Question

Chloe lives in an area where she runs the air conditioner during the 4 hottest months of the year. The air conditioner runs for 7 hours per day at a cost of 21 cents per hour. How much does she spend per year on utility bills for the air conditioner?(Assume there are 30 days in each month)

Answer 1

For per year 63cents per hour

Answer 2

Answer:

She spends $176.4  per year on air conditioning

Step-by-step explanation:

Given,

Chloe runs the air conditioner during 4 months of the year

Air conditioner runs for 7 hours per day at the cost of 21 cents per hour,

that is,

$ 0.21 per hour

Now,

Number of days in one month = 30

So,

Number of days in 4 months = 30 * 4 = 120 days

Therefore, Total number of days when air conditioner is running is 120 days

Number of hours in 120 days when AC will be running = 120 * 7

 = 840 hours

Cost for one hour = $ 0.21

So,

Cost for 840 hours = 0.21 * 840 =  176.4

Hence,

She spends $176.4  per year on air conditioning