# Chapter 12 Sequences and Series - Chapter Review - Page 841: 16

See below.

#### Work Step by Step

After $n$ months he has paid: $200+25n$. This exists only until he has reached $600$, which is when $n=16$. So for $0\leq n\leq16$, the rule is $200+25n$; for $n\geq 17$, it is $600$.

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