Answer:
600
Explanation:
You want the number of employees in 13 years if the current number is 780, and it is decreasing by 2% per year.
Exponential function
The number of employees each year is multiplied by 1.00-2% = 0.98. After 13 years, the current number will have been multiplied by that factor 13 times:
n = 780 · 0.98^13
n = 780 · 0.769022 ≈ 600
The number of employees in 13 years is predicted to be 600.