| A new fast food restaurant opened 5 months ago. The table belows shows the number of burgers they've sold so far. |
| Month | Burgers Sold |
|---|
| 1 | 2,072 | | 2 | 3,139 | | 3 | 3,971 | | 4 | 3,646 | | 5 | 3,547 |
| 16375 |
|
| The next month (after spending some money on an ad) they sold 4 times as many as they had sold in the previous 5 months. How many more burgers did they sell after running the ad? |
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