Answer:
[tex]k\ pen = \frac{\$Nk}{4}[/tex]
Step-by-step explanation:
Given
Cost of 4 pens = $N
Required
Determine the cost of K pens
First, we need to determine the cost of 1 pen
[tex]4\ pen = \$N[/tex]
Divide through by 4
[tex]\frac{4\ pen}{4} = \frac{\$N}{4}[/tex]
[tex]1\ pen = \frac{\$N}{4}[/tex]
Multiply through by k to determine the cost of k pen
[tex]k * 1\ pen = \frac{\$N}{4} * k[/tex]
[tex]k\ pen = \frac{\$Nk}{4}[/tex]
