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

Answer:

$612.75

Explanation:

First, convert 43 minutes into hours

$43\text{ min}\times\frac{1\text{ hour}}{60\text{ min}}=0.716\text{ hours}$

Then, the total number of hours in the month is

$0.716\text{ hours }\times30\text{ days = 21.5 hours}$

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

$1.5kW\times21.5\text{ hours = 32.25 kWh}$

Now, we can calculate the cost as follows

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

Therefore, the answer is $612.75