The answer is P1,000,000. I just need the complete solution.

On January 1I 2020, Selena Company borrowed P20 million to finance the construction of a new building. Interest is payable on the loan at 8%. Stage payments were due throughout the construction period and therefore excess funds were invested during that period. By the end of the project on December 31, 2020, investment income of P600,000 had been earned. How much is the capitalizable borrowing cost