Answer :
Final answer:
The ZP Taxes of the Old Document for the exchange of coupons 3 and 4 should be $7.20.
Explanation:
The question asks for the ZP Taxes of the Old Document when exchanging coupons 3 and 4 from an old flight document for a new one. Given the data in the old ticket, the ZP tax is distributed across four segments (DCA-STL, STL-PHX, PHX-STL, STL-DCA), each amounting to $3.60 (4 segments x $3.60 = $14.40 total ZP tax). When exchanging only coupons 3 (PHX-STL) and 4 (STL-DCA), the combined ZP tax is the result of adding the corresponding values: $3.60 (for PHX-STL) + $3.60 (for STL-DCA) = $7.20.
Hence, for the exchange of coupons 3 and 4, the amount that should be entered as the ZP Taxes of the Old Document is $7.20.