ANSWER
The correct answer is A
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
[tex]=40+45+55+50+50+30+45+40+60=415[/tex]
The total hours of printer B only
[tex]=50+50+30=130[/tex]
Total number of cards produced over the three weeks
[tex]=7950+7800+9600=25350[/tex]
We can use ratio and proportion to determine the total cards produce by printer B only.
[tex]415:25350[/tex]
[tex]130:x[/tex]
If less, more divides
[tex]x=\frac{130\times 25350}{415} \approx7941[/tex]
Total cost of Printer B in 130 hours
$[tex]=130 \times 15=1950[/tex]
The ink cost
[tex]=\frac{1950}{7941}[/tex]
[tex]=0.2456[/tex]
$[tex]\approx 0.30[/tex]
to 2 decimal places
