Split the $600 into 10 equal parts (each = 10%). Savings are 20% = 2 parts.<br><br>[[model:questions/solutions/q4769.png]]<br><br>• 100% → $600, so 10% → $600 ÷ 10 = $60<br>• Saves 20% → 2 × $60 = $120<br><br>Wendy saves $120.<br>Check: 20% of $600 = 0.2 × 600 = $120. ✓