Discount = Original price - New price.<br>
Percentage discount = \(\frac{\text{Discount}}{\text{Original price}} \times 100\%\).<br><br>
• Original price = $20.00<br>
• New price = $16.20<br>
• Discount = $20.00 - $16.20 = $3.80<br>
• Percentage discount = \(\frac{3.80}{20.00} \times 100\%\)<br>
• = \(0.19 \times 100\% = 19\%\)<br><br>
A discount of 19% was given.<br><br>
Final Answer: 19%