Question

The main printer in the Ivy Tech library can produce an average of 639copies every hour. For every 36 pages, it costs the college $0.06 forelectricity and supplies. If the library is open from 9AM to 9PM, howmuch money does the college use on printing each day?

Answer 1

You know that:

- An average of 639 copies per hour can be produced by the main printer.

- The cost for electricity and supplies is $0.06 for every 36 pages produced.

- The library is opened for 12 hours.

Let be "x"the cost (in dollars) for electricity and supplies for 639 copies produced in 1 hour.

You can set up the following proportion:

`(0.06)/(36)=(x)/(639)`

Solve for "x":

`\begin{gathered} ((0.06)/(36))(639)=x \\ \\ x=1.065 \end{gathered}`

Knowing that the cost for electricity and supplies for 639 copies produced in 1 hour is $1.065, youo can multiply it by 12, in order to calculate how much money the college uses on printing each day:

`(1.065dollars\text{)}(12)=12.78dollars`

The answer is: The college uses $12.78 on printing each day.