We can solve this problem by using the formula:
 1 + fractional increase = (original employees + new employees) / original employees
 Lets say,
 x = original employees
 Therefore substituting the known values:
 1 + 0.05 = (x + 30) / x
 1.05 x = x + 30
 0.05 x = 30
 x = 600
 Therefore the number of employees working now is:
 x + 30
 = 630 employees