Pooh borrowed ₱10,620.00 from Dorah on October 30, 2015. He promised to repay it after four months, together with the interest at 8% simple interest rate. However, he was unable to repay the debt and...

Pooh borrowed ₱10,620.00 from Dorah on October 30, 2015. He promised to repay it after four months, together with the interest at 8% simple interest rate. However, he was unable to repay the debt and its interest on time. When he settled his debt on April 16, 2016 he was required to pay an additional of 10% on the unpaid amount for the time after the due date. How much did he pay?