Bill purchased 4 pens for $3.32, including $.16 sales tax. Find the cost of 1 pen.

I need this put into an equation with a variable.

4p = 3.32 - 0.16

0.79 Let's denote the cost of one pen as "x". We know that Bill purchased 4 pens for $3.32, including a sales tax of $0.16.

To find the cost of one pen, we can set up the equation based on the given information.

The total cost of 4 pens is $3.32, including the sales tax. Therefore, the cost of 4 pens without the sales tax would be $3.32 - $0.16 = $3.16.

Since Bill purchased 4 pens, the cost of 4 pens without the sales tax can be written as 4x.

So, we have the equation: 4x = $3.16.

Now we can solve for "x", the cost of one pen:

Divide both sides of the equation by 4:

4x/4 = $3.16/4.

x = $0.79.

Therefore, the cost of one pen is $0.79.