employee manager classes problem

business.rb

class Employee
  attr_accessor :name, :title, :salary, :boss

  def initialize
    @name
    @title
    @salary
    @boss
  end

  def bonus(multipler)
    @salary * multipler
  end
end


class Manager < Employee
  attr_accessor :employees

  def initialize
    @employees = []
  end

  def bonus(multipler)
    @employees.inject(0) do |sum,employee|
      sum + employee.salary
    end * multipler
  end
end


pres = Manager.new; pres.salary = 1000000
vice_pres = Manager.new; vice_pres.salary = 100000
mail_room_person = Employee.new; mail_room_person.salary = 10000

pres.employees << vice_pres
vice_pres.employees << mail_room_person

p pres.bonus(1)
p vice_pres.bonus(1)
p mail_room_person.bonus(1)