Express the amount spent as a fraction of the total, then convert to a percentage.<br><br>• Fraction spent = \(\frac{18}{60}\)<br>• Simplify: \(\frac{18 \div 6}{60 \div 6} = \frac{3}{10}\)<br>• \(\frac{3}{10} \times 100\% = 30\%\)<br><br>Final Answer: 30