KIndly base your answer in philippine setting 2021

1. Four law students rented the condominium of Cindy for a period of one year. After one semester, three of them returned to their province in Bataan, Bulacan and Pangasinan. The fourth student remained in the vicinity. Cindy discovered that they left unpaid utility bills in the total amount of P80,000.00. The lease contract provided that the lessees shall pay for the utilities in the leased premises. Cindy demanded that the fourth student pay the entire amount of the unpaid utility bills, but the latter is willing to pay only one fourth (1/4) of it. Who is correct? Why? 2. Mika, Mike and Michael are solidary debtors under a loan obligation of P300,000.00 which has fallen due. The creditor has, however, condoned Mika's entire share in the debt. Since Mike has become insolvent, the creditor makes a demand on Michael to pay the debt. 2.a. How much, if any, may Michael be compelled to pay? 2.b. To what extent, if at all, can Mika be compelled by Joey to contribute to such payment