Answer:
$1058
Explanation:
The computation of expense deduction is shown below:-
Airfare to and from San Diego $478
Add: Hotel charges while on business $340
Add: Meals while on business (50% × $260) $130
Add: Car rental while on business $110
Add: Joan's travel expense deduction $1058
Here Actual rental on business $110 or as per standard mile rate, so nothing is mentioned for mile rate or using mile. so we consider actual used $110