pls answer :) it would be a very big help for me. i will use it to check my work, thank you so much!

9. Deposits of Php 1500 each were made in a sinking fund at the end of each year. If the fund earned interest at the rate of 6% per annum, what was the principal in the fund immediately after the seventh deposit was made? 10. What cash payment will be necessary to liquidate payments of Php 125000 at the end of each month for 18 months when interest is charged at 6.17% per year