ALVIN owes CARL P20,000 due on May 27, 2019. ALVIN owes BERNA P16,000 due on MARCH 26, 2019. ALVIN obliged himself to deliver to CARL a SACK OF RICE valued at P12,000 on MARCH 30, 2019. On MARCH 31, 2019, ALVIN paid CARL P20,000. If ALVIN makes an application of payment: