1. X, a theater operator enters into a contract with Y, a celebrity singer, where the latter will sing at X's theater for a period of 20 days. After two days performance, Z, another theater operator, enticed Y to sing in his theater doubling Y's compensation. Y accepted the offer right away and began to sing in Z's theater from the third day and for 20 days. Discuss the liability of Y and Z if any.
2. ABC Manufacturing Corporation advertised its detergent soap as "washes clothes doubly clean". X, relying on the representation of the corporation bought several cartoons of detergent bars, but discovers that the advertisement is not true. Can he ask for annulment of the sales contract by reason of fraudulent representation? Explain.
3. X, a Visayan resident, is the owner of a 200 square meter (sqm) lot in Tagaytay city. Due to false information from Y, he (X) entered into a contract with Y selling the land at P10,000.00 per sqm when the market value of the same is P30,000.00 pet sqm. Is the contract valid? Why?
4. X mortgage a piece of land to Y which was written in a private instrument (a piece of paper). When Y sought registration of the instrument, the Registry of Deeds refused to register the same because it is not in the proper form. What is the remedy of Y? Give reasons.