Answer:
$159,000
Explanation:
This problem involves arithmetic sequences, because each term is found by adding a common difference to the previous term. If the first term is $78,000, the next is $78,000 + $3000, and so on.
The general sequence is a(n) = $78,000 + $3000(n - 1)
At the end of his 28th (not 29th) year, William would be making
a(28) = $78,000 + $3000(28 - 1) during his 29th year. This comes to
$159,000.