Problem:
Consider the arithmetic sequence defined by $a_1=\frac{67}{20}$, and $a_n=a_{n-1}+10$ for $n > 1$. Compute the nth partial sum, $S_n=\sum_{k=1}^n a_k$, where $n=5$.
Answer:
$\frac{467}{4}$
{'source': 'AMPS', 'file': 'amps/mathematica/algebra/arithmetic_series/39828.txt'}