Math 1350 Please help me solve this

Question

​Joe's annual income has been increasing each year by the same dollar amount. The first year his income was $18, 200, and the 10th year his income was $28,100. in which year was his income $38,000?

His income was $38,000 in the ___th year.

Answer 1

$38,000 in the 20th year!

28,100 - 18.200 = 990 or $990 each year. If 28,100 is the zeroth year, then adding $990 each year gives

28,100 in the 10th year, and $38,000 in the 20th year.