Question

How much (in decimal dollars) does it cost to run a 1,500 W hair dryer for 43 minutes each day for a month (30 days) at a cost of 19¢ per kWh?___________$

Answer 1

$612.75

Step-by-step explanation:

First, convert 43 minutes into hours

`43\text{ min}*\frac{1\text{ hour}}{60\text{ min}}=0.716\text{ hours}`

Then, the total number of hours in the month is

`0.716\text{ hours }*30\text{ days = 21.5 hours}`

Then, 1,500 W is equivalent to 1.5 kW, so the total kWh is equal to

`1.5kW*21.5\text{ hours = 32.25 kWh}`

Now, we can calculate the cost as follows

`33.25\text{ kWh}*\frac{19\text{ \$}}{1\text{ kWh}}=612.75\text{ }`

Therefore, the answer is $612.75