$($a$)$ Write the Python class definitions for the $2$ subclasses of Booking: IndividualBooking,

and GroupBooking.

The IndividualBooking class has:

ONE class variables: $\_$SINGLE with value as $0\mathrm{.}5($additional $50\%$ charge$).$

ONE additional instance variable $\_$single $($bool$),$ to record whether single room is

required.

Constructor must also ensure that the customer is at least $20$ years old, before

initialising the additional instance variable with the given parameter.

raise BookingException if customer is less than $20$ years old

For cost method, return the final cost as scheduled tour cost with $50\%$ surcharge if

single room is required.

For addSeats method, raise BookingException with message that it is not possible

to add seats for individual booking.

The GroupBooking class has:

ONE class variables:$\_$DISCOUNT that is a Dictionary containing the $2$ group size

values and their eligible discounts.

group size $10$ or more will enjoy $10\%$ discount

group size $6$ or more will enjoy $5\%$ discount

Constructor must enforce the following rules:

raise BookingException if group size is less than $2$

raise BookingException if all customers are less than $20$ years old

For getDiscount method, return the eligible discount by checking against the classvariable

$\_$DISCOUNT. Return $0$ if this group booking has less than $6$ customers.

For the cost method, take into consideration if the group is eligible to any discount

before computing the final cost. If group is not eligible for any discount, then the

final cost will be scheduled tour cost multiply by number of customers.

Implement the method addSeats with the following rules:

In the given list of customers $($parameter$),$ ensure that none of them are not

already in this booking. Otherwise, raise BookingException with appropriate

message.

Invoke the appropriate method of scheduledTour object to ensure that the

scheduledTour can still accommodate the number of customers

If yes, add the customers into this booking, and return true

Otherwise, raise BookingException with message indicating that the scheduled tour may have

reached full capacity