Please answer the following questions and show the solutions completely. Thank you very much.

4. By the condition of a will, the sum of P20,000 is left to a girl to be held in the trust fund by her guardian until it amounts to P50,000. When will the girl receive the money if the fund is invested at 8% compounded quarterly? 3. On her 8th birthday, a girl has left with an inheritance. The inheritance will be paid in a lump sum of P20,000 on her 21 st birthday. What is the present value of the inheritance as of the girl's 8 th birthday if the interest is 4% compounded annually