This commercial law assignment analyzes three distinct scenarios. The first involves promissory estoppel, examining whether a landlord can reclaim full rent and arrears despite a prior agreement to reduce rent. The second scenario focuses on exclusion clauses within a contract for electrical engineering specifications, determining the validity of a clause limiting liability for damages caused by negligence. The final case explores misrepresentation in a business sale, assessing whether a buyer can rescind the contract and recover funds due to false statements made during the sale. Each answer applies relevant legal principles, case law, and provides conclusions based on the presented facts, demonstrating an understanding of contract law principles.