Change in Arithmetic and Geometric Sequences Practice Test

Bacteria doubles hourly in a geometric sequence with $a_1=200$ and $r=2$: 200; 400; 800. Using the given terms, what is the $n$th term of the sequence?

A salary follows an arithmetic sequence with $a_1=30{,}000$ and $d=1{,}000$: 30,000; 31,000; 32,000. Based on the sequence, calculate the total change after 10 terms.