A professor's graduate assistant can grade a quiz in 40 seconds. Over the course of an academic year he assists with 6 sections of a course with an average of 30 students with 10 quizzes in each section. If he is paid $8 an hour, how much is his annual quiz-grading labor cost to the university?

Camilo is a self-employed roofer. he reported a profit of $30,000 on his schedule c. he had other taxable income of $5,000. he paid $3,000 for hospitalization insurance. his self-employment tax was $4,656. he paid his former wife $4,000 in court-ordered alimony and $4,000 in child support. what is the amount camilo can deduct in arriving at adjusted gross income (agi)?