Incorrect. Write the rate as cost per bottles and then reduce the fraction. $\displaystyle\frac{{\text{\$}{6.90}\div{6}}}{{{6}\ \text{ bottles}\div{6}}}=\frac{{\text{\$}{1.15}}}{{{1}\ \text{ bottle}}}\usepackage{cmbright}\Huge\$ . The correct answer is $1.15.