Start with 3900 points, take away the 1600 she spent, then add the 850 she gained.<br><br>[[model:questions/solutions/q4137.png]]<br><br>• After buying → 3900 − 1600 = 2300<br>• After gaining → 2300 + 850 = 3150<br><br>June has 3150 points now.<br>Check: 3900 − 1600 + 850 = 3150. ✓