1. A is an agent of B for the sale of the latter's real properties in Angono, Rizal. When the pandemic hit, B voluntarily reduced the prices of his real property to help those who are in financial difficulty. Taking advantage of the offer, A bought one of the properties of B. Is the sale valid. Why or why not?
2. X sold a parcel of registered land to Y on January 2020. X sold the same parcel of land to Z on January 2021. Who has a better right if Z, after having knowledge of the prior sale to Y, started to occupy the property and constructed fences therein? Explain.