Suggestions on SOLID principles

[Betancourt1996]

Hello, these are some suggestions to implement some solid principles.
a class should handle the calculation of Sailors salaries.
some functions like randSailorid must have a Sailor object as a parameter in order not to be used by other classes.
When adding passengers, other types of passengers such as animal passengers are left aside, so it is recommended to create a parent class "Passengers" to use "HumanPassengers" "AnimalPassengers", or any other that may be presented.