For 1 and 2, just please explain to me the solution. Thank you!!

1.Due to an unstable medical condition, Puma Nao thought that it is only proper for him to transfer his properties to his love ones now instead of waiting for his death. He then transferred various condominium units to his children costing P180,000,000 while he was undergoing major medical operation. The fair value of the said condominium units at the date of transfer to Puma Nao's children was P200,000,000. At the time of Puma Nao's death, the fair market value of the properties transferred increased to P250,000,000.

What amount should be included in the computation of his gross estate?

answer: 20,000,000

2. Among the properties included in the gross estate of Bruce, the decedent, at the time of his death was a newly developed resort in Panatag Island valued at P20,000,000. The cost of the said property was P23,000,000. Natasha is the sole heir to the property. During the settlement of the estate and before the last day of paying the estate tax, the military stand-off between China and Philippines intensified. To address the issue, various Philippine-US Balikatan exercises were conducted in the area. Unfortunately, some of the missile used in the exercise misfired. The missiles accidentally hit the new developed resort inherited by Natasha. It was determined that the fair value of the property after the incident was reduced to P500,000.

a.) What should be included as part of the gross estate? A: 20,000,000

b.). What should be included as part of allowable deductions from the gross estate? A: 19,500,000

c). What should be included as part of allowable deductions from the gross estate assuming that the said property was insured for P25,000,000? A: P 0

3.Explain the valuation of the gross estate for:

A. Residents or Citizen

B. Nonresident Aliens