Ramp fuel
will be:
Taxy + Trip + Contingency + Alternate + Final Reserve
Calculate contingency as 5% of Trip unless told otherwise,
Calculate final reserve (for a jet) as 30 mins
holding at 1500ft above destination alternate.
This
gives: Holding fuel should be sufficient for 30 minutes, therefore take half
the figure provided in the question (4000kg).
Contingency
fuel should amount to 5% of the cruise fuel required (i.e. 5% of 60000kg =
3000kg)
Thus,
adding everything together you have:
600 + (6*10000) + 4000 + 10200 + 3000 = 77800kg