Hi guys, pretty new to advanced maths after a long career break and find i am struggling quite regularly on an HNC i am working on for work.

One of the questions i have is regarding geometric progression, it is as follows.

A firm starts work with 110 employees for the 1st week. The number

of the employees rises by 6% per week. How many persons will be

employed in the 20th week if the present rate of expansion continues.

Now i have worked it out as S(20) = 110 x (1-1.06^20) divide by 1-1.06

As the answer comes to 4046 with my workings. Obviously very wrong.

Thanks for any help.