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