Answer: 11,700
Explanation:
I assume he gets paid by hour, and since he cut his ours in half he'll be earning half as much: 8000 / 2 = 4000.
He goes to school for 3 semesters which is a year and a half, so he's earning half income for a year and a half = 4000 * 1.5 = 6000
total cost of going to college per semester = tuition + books = (1400 + 500) = 1900
total cost of college for the year and a half (4 semesters) = 1900 * 3 = 5700
so, by working half hours he already reduced his income by half, making him lose 6000 in the course of the year and a half and he lost 5700 in college costs, this makes his total cost = cost of half hours + cost of college = 6,000 + 5700 = 11,700