| A new fast food restaurant opened 4 months ago. The table belows shows the number of burgers they've sold so far. |
| Month | Burgers Sold |
|---|
| 1 | 1,786 | | 2 | 3,564 | | 3 | 1,676 | | 4 | 3,642 |
| 10668 |
|
| The next month (after spending some money on an ad) they sold 4 times as many as they had sold in the previous 4 months. How many fewer burgers did they sell before running the ad than they did after running it? |
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