Blimp Co. reported net income of P1,000,000 for the year ended December 31, 2020. Upon further inspection of its records, the entity failed to recognized prepaid insurance of P12,000; accrued expense and revenue of P2,000 and P4,000, respectively. An advance payment of P10,000 from a customer was also entirely recognized as a liability. It was found out that Blimp has already earned 30% of it. Lastly, sales from a customer amounting to P20,000 was incorrectly recognized as P2,000.

1. Following the concepts of accrual accounting, how much is the correct net income of Blimp in 2020?

2. Why are adjusting entries prepared at the end, and not at the beginning, of a period?