Calculate the present value of each annuity (round to two decimal places and include a $ in your answer):

a) $200 withdrawn at the end of each year for 6 years at 4%, compounded annually
b) $1000 withdrawn every six months for 4 years at 10%, compounded semi-annually
c) $750 withdrawn at the end of every three months for 10 years at 4.5%, compounded quarterly