The age old problem with fuel calculations .... contingency. Unfortunately there does not seem to be any consistency in the exam questions ... so for this one ...

TOM = DOM + TL + FUEL

Contingency, as you say, the greater of 5% TRIP and 5 mins holding at 1500ft.

You are given FINAL RESERVE - but they do not tell you what kind of aeroplane it is ... assuming it is a turbine engined aeroplane, 1225 kg is 30 mins holding, so 5 mins holding would be 205 kg.

5% TRIP = 90 kg.

SO, there is uncertainty - do the calculation with both CONTINGENCY fuels - see what turns up in the answers ...

5% cont ....... TOM = 34000 + 13000 + 1800 + 90 + 1400 + 1225 = 51515 kg

5 mins cont ... TOM = 34000 + 13000 + 1800 + 205 + 1400 + 1225 = 51630 kg

So, I will go with 51515 kg