This table shows the ticket price for each person to visit a zoo in winter.

adult = £18
child (3-17) = £14
child ( under 3) = free

A family of two adults, one child aged 8 and one child aged 1 visit the zoo in winter.

In summer, the zoo increases the prices.

An Adult ticket increases by 20%.
A Child ticket increases by 15%.

How much more does it cost the family to visit in the summer than in the winter?