To find the answer, we first must write an equation. ($17.90+(X Notebooks)) + 6% Sales Tax = $30.74 Now, we solve the equation for X. First, we have to find the total before the sales tax. To do this, we divide the total by 1.06 $30.74/1.06= $29 Now, we subtract the cost of the backpack and solve for X $17.90+X=$29 X=11.10 Given that X is the total of 6 Notebooks, we divide $11.10 by 6 to find the price for each Notebook. $11.10/6=$1.75 per notebook It costs $1.85 for each notebook before sales tax and $1.96 after sales tax.
