Answer:
£2628.80 (might not be correct, but here me out \o/)
Explanation:
16 and overs : 18.60
under 16 : 12.80
155 people and 49 are under 16 right
155 - 49 is 106, this is the amount of 16 and overs bought a ticket
then u do 318.60 x 106 = £1971.60
and £12.80 x 49 = £657.20
then add £657.20 + £1971.60 and u get £2628.80
p.s: again im not 100% sure if its correct :)