(i)[3]
The 8 friends split into two groups of 4, one for taxi $P$ and the other for taxi $Q$, with Jon and Sarah in the same taxi. Determine the number of different ways this can be arranged.
(ii)[4]
Each taxi has 1 seat in the front and 3 seats in the back (see diagram). Mark is placed in the front of taxi $P$, and Jon and Sarah are seated together in the back of taxi $P$ next to one another. Find how many different seatings are now possible for the 8 friends.