You must take
off with TRIP + RESERVE....and at T/O reserve must equal 30% of trip, so in
other words, you actually take off with 130% of trip fuel.
T/O fuel = 127 = 130/100 x TRIP
Therefore TRIP FUEL = 98 kg
After 2 hrs of a 2.7 hr sector, 0.7 hr remains
So the fraction of TRIP FUEL remaining is:
0.7/2.7 x 98 = 25 kg
Reserve needs to be 30% of REMAINING trip fuel
30/100 x 25 = 8 kg