Given n employees and an expansion rate r, find the number of employees after t years.

The number of employees after 't' years can be calculated using the formula for compound growth: Final Employees = Initial Employees * (1 + Growth Rate)^Number of Years. So, if you start with 'n' employees and the expansion rate is 'r' per year, after 't' years, the total number of employees will be n * (1 + r)^t.