Final answer:
The cost of TDY MALT for one round trip mainly depends on the distance traveled, as it's a monetary allowance calculated per mile and can vary with different modes of transportation.
Step-by-step explanation:
The cost of TDY MALT for one round trip depends on the distance. MALT, which stands for Monetary Allowance in Lieu of Transportation, is provided to cover the travel expenses when an individual is traveling on temporary duty (TDY). This allowance is generally calculated based on the official distance between the traveler's home station and the TDY location multiplied by the current per mile rate. Different rates may apply for different modes of transportation, but the primary factor determining the cost is the distance traveled.