Where should I put my first method

class CompanyFinanse
{
      public decimal WeightedSumOfWorkerSalaryAndSuperior(Worker WorkerA, Worker Superior)
      {
           return WorkerA.Salary + Superior.Salary * 2;
      }
}

public class Worker {
     public Worker Superior {get;set;}
     public readonly decimal WeightedSalary {
         get {
              return (Superior.Salary * 2) + (this.Salary)
         }
     }
     public decimal Salary {get;set;}
}

public static class Finance {
     public static decimal WeightedSumOfWorkerSalaryAndSuperior(Worker WorkerA, Worker Superior) {
         return WorkerA.Salary + Superior.Salary * 2; }
}