### Home > PC3 > Chapter 12 > Lesson 12.1.4 > Problem12-65

12-65.

Determine the sum of the series $100 + 100(1.005) + 100(1.005)^2 + . . . + 100(1.005)^{11}$.

$S_n=\frac{a(r^{n}-1)}{r-1}$

Remember $n$ is the number of terms in the series. For this series $n = 12$.