The whole is 100%. She spent 60%, so the $20 left is the other 40%.<br><br>[[model:questions/solutions/q5445.png]]<br><br>• Left → 100% − 60% = 40% → $20<br>• 10% → $20 ÷ 4 = $5<br>• 100% → 10 × $5 = $50<br><br>She had $50 at first.<br>Check: 60% of $50 = $30 spent, $50 − $30 = $20 left. ✓