Charlotte traveled to Annapolis to attend a three-day business conference. After her meetings concluded, she stays 2 additional days sightseeing. Charlotte's airfare is $400 and pays $110 per night for lodging, $60 a day for meals, and $20 a day for incidentals. How much of Charlotte's costs can be deducted as a business expense?

a. $- 0 -

b. $400

c. $880

d. $970

e. $1,200

Please show me how to do the question. Thank you