What amount is required to purchase an annuity that pays $5000 at the end of each quarter

Question:

What amount is required to purchase an that pays $5000 at the end of each quarter for the first 10 years and then pays $2500 at the beginning of each month for the subsequent 10 years? The rate of return on the invested funds is 6% compounded quarterly.
Annuity
An annuity is a series of equal payment made at equal intervals during a period of time. In other words annuity is a contract between insurer and insurance company in which insurer make a lump-sum payment or a series of payment and, in return,...