A family of four buys a family pass to an amusement park. Normally, the family would need to buy four individual tickets: two adult and two children.
The individual child tickets are $75\%$ of the cost of each adult ticket. The family pass consists of four tickets, with the two adult tickets at a $15\%$ discount. Overall, the family saves $25\%$ by buying the family pass.
Approximately how much cheaper is each child ticket in the family pass?