$25.98 excluding tax is remarkable but including tax it should be around $26 and in my opinion delivering on a Friday and in a timely manner no less they should be tipped 20% so it would be around $31 a pretty reasonable tip if you ask me.
Steps I took:
1.( 25.98 + 10% = 26.08).
2. ((round up)).
3. (26 + 20% = 31.2).
4. ((round up again)).
5. (and you get $31).
Have a nice day! Nice to see you again! :3