Okay, here are the steps:
* Hassam buys 2 adult tickets and 2 child tickets
* Let's assume:
** Adult ticket price = $50
** Child ticket price = $25
* So total ticket price = 2 * $50 + 2 * $25 = $200
* The booking fee is 5% of the total cost
* 5% of $200 is $10
* So total payment = $200 + $10 = $210
Therefore, the total Hassam pays altogether is $210