3. Zandre, who turned 20 today, plans to retire on her 60th birthday. For the next 20 years in other words, until her 40th birthday), she wants to invest the same amount at the end of each year, and then leave the final value in the fund for the remaining 20 years until her retirement. She wants to be able to withdraw R250 000 at the end of each year for 20 years once she retires. The first with- drawal will therefore be on her 61st birthday. a) How much must she set aside at the end of each year during the next 20 years if she can earn 10% p.a. on her funds? b) Suppose that she keeps on contributing annually for the full 40 years preceding her retirement. What will the annual amount that she has to invest be to get the same benefit of R250 000 per year