Perguntas de entrevista de vagas de .NET Software Engineer da empresa Roro Solutions

They took a technical round in which there were .Net related questions and then 2 coding questions and then 1 aptitude question, the coding questions are listed below, they wasted my time because even after answering correctly they did not proceed, maybe it was budget's issue, if they had a problem with the budget then they shouldn't have called me and took the interview in the first place.