Here's the question you clicked on:
Carii995
If Josh spends $4,000 a year on tuition and fees, $1,200 a year on books, and forgoes earning $10,000 a year, how much will his four-year degree cost?
so, you add 4000+1200 and multiply by four, because of the four years.
"forgoes earning 10000 a year" means that at the end of 4 years he'll have 40,000 dollars minus his expenses for school. but if the question is just how much it will cost, it is 4000+1200 (4)