i dint understand what answer 7,8,9 please

7. Helen who lives in NY, takes a business trip to Chicago. She spends 8 days on business and stays on for four more days of vacation. Her hotel costs $200 a day and she spends $80 a day on meals. The cost of getting there and back (airfare/cabfare) was $1,500. How much can she deduct? a. $3,420 b. $3,800 C. $3,900 d. $4,300 8. Sally who lives in NY, takes a business trip to Mexico. She spends 12 days on business and stays on for 8 more days of vacation. Her hotel costs $250 a day but she has no expense for meals (her friends and relatives feed her). The cost of getting there and back (airfare/cabfare) was $3,000. How much can she deduct? a. $4,800 b. $6,000 C. $6,800 d. $8,000 9. True or False: On a combined business/pleasure trip, if the trip is "primarily for pleasure," no deduction will be allowed for the cost of the airfare, regardless of whether the trip is within the U.S. or outside of the U.S