On December 25, 1985, Peter and Andrea De Guzman were married. On June 12, 2020 Andrea died. On January 10, 2021, the inventory of their assets registered as follows: Acquired before marriage Peter Andrea Car P800,000 P550,000 Inherited land 2,000,000 Cash 500,000 Acquired during marriage Peter Andrea Cash P250,000 P350,000 Fruits from inherited land 500,000 These are in addition to a family home worth P12,800,000 and a farm worth P15,000,000 which they acquired jointly. Compute for the estate tax due provided that the following ordinary deductions were accounted: Funeral expenses P350,000 Unpaid mortgages 400,000 

Required: 

1. Compute for the estate tax due using 6% flat rate.

2. Justify the basis of computation, use the rules for married decedent as reference