Question

The tables below show running hours of three printers that produce greeting cards and the total number of greeting cards produced over three weeks.

Printer B uses $15 in ink every hour. What is the ink cost for each card coming from printer B?

A. $0.30
B. $0.50
C. $1.00
D. $1.50

Answer 1

The correct answer is A

Step-by-step explanation

To find the ink cost of each card coming from printer B, we need to find the total cost from printer B and the total number of cards printed by Printer B.

The total hours of all the three printers over the three weeks

`=40+45+55+50+50+30+45+40+60=415`

The total hours of printer B only

`=50+50+30=130`

Total number of cards produced over the three weeks

`=7950+7800+9600=25350`

We can use ratio and proportion to determine the total cards produce by printer B only.

`415:25350`

`130:x`

If less, more divides

`x=(130* 25350)/(415) \approx7941`

Total cost of Printer B in 130 hours

$
`=130 * 15=1950`

The ink cost

`=(1950)/(7941)`

`=0.2456`

$
`\approx 0.30`

to 2 decimal places