Profit Margin Solution

Dodgem use: 60% of 12 is 7.2
Number of sessions: 4 x 8 = 32
Fares per session: 32 x £2 = £64
£64 x 7.2 = £460.80
Earnings - Cost to run: £460.80 - £144 = £316.80
Profit = £316.80