Thinking it as a propotional increase, find the <u>unit rate of change</u>.
values: (0, 536,000), (-5, 441,000), (-1, 517,000)
unit rate of change:



Therefore, the sales increase by $19000 each year.
<u>After 8 years the sale increasement</u>:
Total sales amount:
- current sales + increasement in sales
So, correct answer is : $688,000